| #9039, aired 2024-02-15 | CHEMISTRY TEST $200: The process of photosynthesis converts water & carbon dioxide into organic compounds & this gas oxygen |
| #9039, aired 2024-02-15 | CHEMISTRY TEST $400: It's the branch of chemistry that studies elements & compounds containing little or no carbon, i.e. nonliving stuff inorganic |
| #9038, aired 2024-02-14 | THE AIR THAT I BREATHE $1200: The main gas from an erupting volcano is this 2-word one that also forms clouds, but there's also less benign sulfur dioxide water vapor |
| #9022, aired 2024-01-23 | SQUEAKER OF THE HOUSE $1000: One chirp from this device means the battery is low, not to be confused with the continuous noise that means CO is present so get out a carbon monoxide detector |
| #26, aired 2024-01-23 | ORGANIC CHEMISTRY $100: You can breathe easy knowing photosynthesis causes plants to release this gas as a waste product oxygen |
| #26, aired 2024-01-23 | ORGANIC CHEMISTRY $200: This element's "footprint" is everywhere: by definition, every compound studied by organic chemists contains it carbon |
| #9011, aired 2024-01-08 | SCIENCE $800: The roughly 10 million compounds formed by this element include acetylene & potassium cyanide carbon |
| #9010, aired 2024-01-05 | FAMOUS OBJECTS $4,000 (Daily Double): Carbon-14 dating tests in 1988 said the fabric of this had been made roughly between 1260 & 1390, not much earlier the Shroud of Turin |
| #9003, aired 2023-12-27 | 12-LETTER SCIENCE WORDS $1200: Sugars & starches are this type of organic compound with a name meaning "watered carbon" a carbohydrate |
| #8965, aired 2023-11-03 | THIS CATEGORY DOESN'T STINK $400: 2 odorless ingredients in your Pepsi are caffeine & this gas that gives it bubbles carbon dioxide |
| #8965, aired 2023-11-03 | THIS CATEGORY DOESN'T STINK $800: It's generally odorless, so an odorant is added to let you know if there's a leak or if you left the oven on natural gas |
| #8961, aired 2023-10-30 | ORGANIC CHEMISTRY $800: Atoms in the compound carbon dioxide share two pairs of electrons, forming a double covalent this a bond |
| #8955, aired 2023-10-20 | WHAT'S NEXT? $800: On the periodic table: carbon,
nitrogen,
this oxygen |
| #8937, aired 2023-09-26 | NEXT STOP, VENUS $400: Venus' atmosphere is predominantly made up of this gas contributing to its high temperature carbon dioxide |
| #8926, aired 2023-09-11 | SCIENCE CLASS $200: In natural form a mixture of 3 isotopes, this element is the most abundant in the Earth's crust & in the human body oxygen |
| #8883, aired 2023-05-31 | DUDE, HERE'S YOUR CAR $2,200 (Daily Double): Lamborghini's Sesto Elemento was named for its pioneering use of this, from which much of the car is made carbon |
| #8851, aired 2023-04-17 | ALPHABETICALLY FIRST $2000: Of the chemical elements that begin with "C" cadmium |
| #8770, aired 2022-12-23 | BIOLOGICAL PROCESSES $1200: As part of this system, the thin walls of the alveoli are conducive to extracting carbon dioxide & getting oxygen to the blood the respiratory system |
| #8769, aired 2022-12-22 | CLIMATE $400: A byproduct of using fossil fuels, it's the main greenhouse gas affecting Earth's climate due to human activity carbon dioxide |
| #8750, aired 2022-11-25 | STAYIN' ALIVE $200: John Scott Haldane saved lives when he proposed that canaries in coal mines would give early warnings of this gas carbon monoxide |
| #8747, aired 2022-11-22 | UNDER THE "C" $200: On the periodic table, silicon is directly under this element carbon |
| #8743, aired 2022-11-16 | SPELEMENTARY $1600: Silver +
nobelium +
sulfur +
titanium +
carbon agnostic (Ag No S Ti C) |
| #8736, aired 2022-11-07 | "D" IN SCIENCE $400: If your lab has a tile counter, don't use it to place solid carbon dioxide, aka this; the adhesive will be destroyed dry ice |
| #8730, aired 2022-10-28 | DAYS OF YORE $400: Chinese alchemists in the 9th century mixed saltpeter, sulfur & carbon, creating this history-changing substance gunpowder |
| #8727, aired 2022-10-25 | THE ELEMENTS $200: Swedish chemist Carl Scheele proved that air was made of 2 gases: "fire air", oxygen, & "foul air", this element nitrogen |
| #8719, aired 2022-10-13 | WEIRD SCIENCE $1,400 (Daily Double): Some scientists think Uranus' atmosphere may compress carbon atoms into these, putting the ice in ice giant diamonds |
| #8691, aired 2022-07-25 | CHEMISTRY $200: Organometallic compounds are defined by the presence of a bond between a metal & this element carbon |
| #8682, aired 2022-07-12 | HUMAN ANATOMY $1000: These tiny air sacs in the lungs are where oxygen & carbon dioxide are swapped in the bloodstream alveoli |
| #8669, aired 2022-06-23 | THAT USED TO BE A TRADEMARK $400: A company of the same name trademarked this term for solid carbon dioxide in 1925 Dry Ice |
| #8666, aired 2022-06-20 | CHEMICAL COMPOUNDS, COMMONLY $600: Chimney sweeps may find this 4-letter form of amorphous carbon coating their workplace soot |
| #8646, aired 2022-05-23 | THE RAINFORESTS $800: Help the rainforest by turning off lights & driving less, which reduce this, not made by a shoe but by CO2 emissions carbon footprints |
| #8633, aired 2022-05-04 | KEEPIN' UP WITH NASA $200: In 2016 NASA detected this key-to-life element in a comet's tail, suggesting that comets may have brought it to Earth carbon |
| #8628, aired 2022-04-27 | THE ANCIENT WORLD $1600: Over 2,000 years ago in India, iron & wood were combined to make wootz, an early version of this iron-carbon alloy steel |
| #16, aired 2022-02-18 | SCIENCE FACT $1600: Chemistry news: this unit is no longer related to the No. of atoms in 12 grams of carbon-12, but directly to Avogadro's constant a mole |
| #15, aired 2022-02-18 | BETWEEN 10 & 20 $1000: Developed by chemist Willard Libby, this method named for an isotope is used to date fossils carbon-14 dating |
| #11, aired 2022-02-16 | DO ME A SOLID $200: This gas is liquefied & frozen to make dry ice carbon dioxide |
| #8546, aired 2022-01-03 | PHYSICAL SCIENCE $2000: American physicist Willard F. Libby developed the method of dating artifacts via the decay of this isotope of carbon carbon-14 |
| #8537, aired 2021-12-21 | GEOLOGY $1,000 (Daily Double): The same substance may crystallize in 2 forms, like these 2 forms of carbon: one was first converted to the other in a lab in 1955 graphite into diamond |
| #8531, aired 2021-12-13 | CHEMISTRY $800: In 1755 Joseph Black called it "fixed air"; today we call it a planetary problem carbon dioxide |
| #8521, aired 2021-11-29 | HELPING THE PLANET $200: Georgia-based carpet company Interface makes carpet tiles that are not merely this element "neutral", they're "negative" carbon |
| #8482, aired 2021-10-05 | IN SEARCH OF ALIEN LIFE $1000: A theoretical basis of alien life is this 2nd most common element in Earth's crust; scientists have made enzymes bond it to carbon silicon |
| #8477, aired 2021-09-28 | MISSING POISONS UNIT $600: Without color, odor or taste, ____ ____ is symbolized CO & one way to avoid it is to have your chimney cleaned & inspected annually carbon monoxide |
| #8470, aired 2021-09-17 | LET'S VISIT MARS $2000: Mars' seasonal polar ice caps aren't frozen water but frozen this gas, the principal component of its atmosphere carbon dioxide |
| #8450, aired 2021-07-23 | DOING THE SAFETY DANCE $200: FEMA says to replace the 9-volt battery at least once every year in this home device; some even include carbon monoxide sensors smoke detector |
| #8431, aired 2021-06-28 | SCIENCE $400: In photosynthesis, green plants use sunlight & carbon dioxide to produce this simple sugar as an energy source glucose |
| #8417, aired 2021-06-08 | L-M-N $400: Yes, my dear Watson, this adjective refers to carbon, or even potassium elemental (elementary) |
| #8413, aired 2021-06-02 | I'D LIKE TO BUY $600: I want to lay some bricks, so I'll take a Kraft tool carbon steel one of these mortar spreaders with a flat plate & a handle a trowel |
| #8399, aired 2021-05-13 | SCIENCE $400: A 2020 study says that in the 2030s the Amazon tropical forest may go from a net absorber to a net emitter of this gas carbon dioxide |
| #8386, aired 2021-04-26 | HARD SCIENCE $3,000 (Daily Double): The number used to designate a pencil's hardness, relates to the ratio of clay to this material, a form of carbon graphite |
| #8376, aired 2021-04-12 | SCIENCE NICKNAMES $2000: After a nickname of architectural innovator Mr. Fuller, it's the nickname of the carbon form seen here a buckyball |
| #8354, aired 2021-03-11 | IT'S ALL ONIONS $1,000 (Daily Double): When you chop them, onions make your eyes water because they contain compounds of this element also found in gunpowder sulfur |
| #8351, aired 2021-03-08 | CURVE YOUR ENTHUSIASM $400: With readings taken at Mauna Loa Observatory, the Keeling Curve shows the buildup of this gas in the atmosphere carbon dioxide |
| #8292, aired 2020-12-01 | OOOH...FIREWORKS! $2000: You can make a safer type of the "black" this reptile with baking soda & sugar--it produces CO2 & carbon ash snake |
| #8287, aired 2020-11-24 | FARMING $200: By repurposing manure, some farms are trying to be what's called this element "neutral" carbon |
| #8278, aired 2020-11-11 | TRANSPORTATION $1200: In 2007 this company unveiled its Dreamliner, a commercial jet made of 50% carbon-composite materials Boeing |
| #8276, aired 2020-11-09 | KEN JENNINGS--MARINE BIOLOGIST $400: (Ken Jennings presents the clue.) The giant larvacean, which looks like a tadpole surrounded by a balloon of mucus, helps battle climate change; disproportionate to its small size, the gelatinous animals, with their protein & cellulose snot palaces, have helped the ocean remove this planet-warming gas from the atmosphere carbon dioxide |
| #8254, aired 2020-10-08 | DIAMONDS ARE FOREVER $400: Diamonds are naturally occurring forms of this element carbon |
| #8229, aired 2020-06-04 | THROWING YOU A CURVE $1200: Used in global warming studies, the Keeling curve charts the buildup of this gas in earth's atmosphere carbon dioxide |
| #8213, aired 2020-04-29 | WE'D LIKE TO MAKE A CORRECTION $400: Dear Abby stated, "Charlie's hiccups were cured... through the use of carbon monoxide. It should have read" this--so close! carbon dioxide |
| #8199, aired 2020-04-09 | CHEMISTRY $4,000 (Daily Double): The main products of the alcoholic fermentation of sugar are ethanol & this gas carbon dioxide |
| #8176, aired 2020-03-09 | YOU'RE SHOWING YOUR AGE $1,500 (Daily Double): There's speed dating, online dating & this method developed in 1946 that can tell archaeologists an artifact's age carbon dating |
| #8169, aired 2020-02-27 | A LITTLE ALLITERATION $400: Concentrations of these, like methane & carbon dioxide, have driven climate change greenhouse gases |
| #8146, aired 2020-01-27 | DANGEROUS COLORS $1600: Leonardo da Vinci used a black powder made from carcinogenic sources like coal tar & named for this element carbon |
| #1, aired 2020-01-07 | CHEMISTS $400: (Bryan Cranston delivers the clue.) August Laurent & Jean-Baptiste Dumas hated each other, but they worked together to pioneer this branch of chemistry that focuses on carbon & the carbon compounds found in living things organic |
| #8131, aired 2020-01-06 | STARTS & ENDS WITH THE SAME VOWEL $2000: Condition due to lack of oxygen & surplus of carbon dioxide anoxia (asphyxia) |
| #8128, aired 2020-01-01 | U.S. FACTS & FIGURES $200: Each year U.S. fossil fuels emit around 5 billion metric tons of this gas CO2 (carbon dioxide) |
| #8108, aired 2019-12-04 | LET'S SCIENCE THE HECK OUT OF THIS $400: If Venus seems like a greenhouse, it's because its atmosphere is almost completely made of this greenhouse gas carbon dioxide |
| #8105, aired 2019-11-29 | WOMEN OF SCIENCE $400: "Queen of Carbon Science" Mildred Dresselhaus was the first female National Medal of Science winner in this "E" in STEM engineering |
| #8055, aired 2019-09-20 | "ON" OR "OFF" $1600: Next time you fly, consider buying carbon these to compensate for adding pollution to the atmosphere offsets |
| #8033, aired 2019-07-10 | SCIENCE NEWS $400: In 2017 scientists developed a faster way to make magnesite, a mineral that can capture & store this greenhouse gas carbon dioxide |
| #8014, aired 2019-06-13 | ELEMENT NAMES $400: This element gets its name from the Latin for "charcoal" carbon |
| #8006, aired 2019-06-03 | PICTURE THE IDIOM $800: Greenhouse gas emission due to human activity leaves behind this a carbon footprint |
| #7995, aired 2019-05-17 | FIRE & ICE $1200: Dry ice is this gas in its solid form carbon dioxide |
| #7965, aired 2019-04-05 | 18th CENTURY SCIENCE $4,000 (Daily Double): Next time you grab a soda, you can thank Joseph Priestley, who dissolved this gas in water in 1768, making it fizzy carbon dioxide |
| #7961, aired 2019-04-01 | THE WORLD OF MONEY $400: Via cap & trade, international companies can sell unused pollution rights in the trade system named for this element carbon |
| #7958, aired 2019-03-27 | THE ELEMENTS $400: (Jimmy of the Clue Crew presents from SpaceX in Hawthorne, CA.) The Falcon 9 is 230 feet tall & weighs 1.2 million pounds, so its retractable landing legs have to be immensely strong; they're made of carbon fiber surrounding a honeycomb of this light but strong metal, atomic number 13 aluminum |
| #7915, aired 2019-01-25 | PEST CONTROL $400: Washington, D.C. is dealing with rats by dropping dry ice down their holes; then this gas finishes them off carbon dioxide |
| #7895, aired 2018-12-28 | ALTERED CARBON $400: The Protect device made by Nest can detect this dangerous gas, in addition to smoke carbon monoxide |
| #7895, aired 2018-12-28 | ALTERED CARBON $1200: This solid residue left when coal is distilled sounds like a refreshing beverage coke |
| #7895, aired 2018-12-28 | ALTERED CARBON $1600: Used in carbon dating, the isotope radiocarbon has this number for its approximate atomic weight 14 |
| #7895, aired 2018-12-28 | ALTERED CARBON $2000: Mix carbon with nitrogen & hydrogen to get this type of poison aka prussic acid--actually, don't cyanide |
| #7895, aired 2018-12-28 | ALTERED CARBON $3,000 (Daily Double): (Sarah of the Clue Crew delivers the clue.) A sheet of carbon atoms is formed by strong covalent bonds. However, the bonds connecting multiple sheets are much weaker, resulting in this soft substance, used in pencils graphite |
| #7866, aired 2018-11-19 | ELEMENTAL $400: When you're talking about an organic compound, you're talking about one based on this element carbon |
| #7859, aired 2018-11-08 | HEALTH & MEDICINE $400: The CDC says a buildup of this gas in the home can't be seen or smelled but it can kill, so make sure you have a working detector carbon monoxide |
| #7855, aired 2018-11-02 | UNITS OF MEASURE $800: The EPA standard for carbon monoxide exposure includes 35 of these "parts" parts per million |
| #7840, aired 2018-10-12 | C & C ALLITERATION FACTORY $600: When you CC a coworker on an e-mail, "CC" is short for this, representing bygone technology carbon copy |
| #7817, aired 2018-09-11 | SCIENCE AROUND US $200: Curtains made of carbon fiber rods are specifically designed to help buildings withstand these earthquakes |
| #7767, aired 2018-05-22 | SCIENCE $4,000 (Daily Double): A unit of atomic mass, a dalton is defined as 1/12th the mass of the "12" isotope of this element carbon |
| #7742, aired 2018-04-17 | COMBINATIONS $2000: Propane--these 2 elements carbon and hydrogen |
| #7731, aired 2018-04-02 | PLANETARY FACTS $400: Its polar caps, which are believed to be carbon dioxide ice & water ice, grow in the winter & shrink in the summer Mars |
| #7711, aired 2018-03-05 | SCIENCE $200: Bed bugs are attracted to this gas, as it indicates the presence of humans, so they can be lured with dry ice carbon dioxide |
| #7697, aired 2018-02-13 | HORMONES $400: The 1990s weren't baseball's sex hormone era, but sex hormones are these compounds of 17 carbon atoms steroids |
| #7692, aired 2018-02-06 | MORE THAN ONE LIFE TO LIVE $800: Takeshi Kovacs can just download into a new body when he dies in Richard Morgan's "Altered" this element Altered Carbon |
| #7650, aired 2017-12-08 | WRITERS & WRITING $400: This author of the letter "J'accuse", which sparked the exoneration of Alfred Dreyfus, died of carbon monoxide poisoning (Émile) Zola |
| #7640, aired 2017-11-24 | PENCIL IT IN $600: There's no danger of lead poisoning with a normal pencil--the "lead" is a mixture of clay & this form of carbon graphite |
| #7612, aired 2017-10-17 | LET'S SAVE THE PLANET $200: The 350 in 350.org refers to this gas, which the org. wants to keep at less than 400 parts per million in our skies CO2 (carbon dioxide) |
| #7605, aired 2017-10-06 | CHEMISTRY $2000: The hollow carbon molecule seen here is called a buckyball & was named for this non-chemist Buckminster Fuller |
| #7585, aired 2017-07-28 | MEDICAL "E"s $800: (Sarah of the Clue Crew shows lungs and alveoli on the monitor.) The exchange of carbon dioxide for oxygen takes place in tiny air sacs in the lungs called alveoli; smoking can make breathing difficult by causing the destruction of alveoli in this chronic lung disease emphysema |
| #7551, aired 2017-06-12 | ROCKS & MINERALS $1600: Containing more carbon than other types, this highest ranking coal has a metallic-like luster anthracite |
| #7548, aired 2017-06-07 | THE ELEMENT $900 (Daily Double): "C" if you can guess this element that follows boron on the periodic table carbon |
| #7546, aired 2017-06-05 | SCIENCE TERMS $2000: Yeast can trigger this process which produces ethyl alcohol & carbon dioxide fermentation |
| #7523, aired 2017-05-03 | AN ENVIRONMENTAL CATEGORY $400: Using natural gas as a fuel releases half as much of this greenhouse gas as coal carbon dioxide |
| #7519, aired 2017-04-27 | KINDA SCIENCEY $800: Kids shouldn't use this word on the playground, but they can use it to describe acids like palmitic with long carbon chains fatty |
| #7497, aired 2017-03-28 | PICK YOUR POISON $200: First Alert's CO600 detects it:
ammonia,
carbon monoxide,
radon carbon monoxide |
| #7495, aired 2017-03-24 | OIL! $800: In oil exploration geologists look for these compounds that consist only of the 2 elements symbolized by H & C hydrocarbons |
| #7476, aired 2017-02-27 | PIZZA $600: (Sarah tosses a pizza dough.) We're using synthetic pizza dough to practice our technique; good hand-tossed pizzas have a lot of this protein in the flour that traps carbon dioxide & helps the dough stretch gluten |
| #7468, aired 2017-02-15 | SCIENCE $400: By definition it's the branch of chemistry that deals with non-carbon compounds inorganic |
| #7436, aired 2017-01-02 | STAR TALK WITH NEIL deGRASSE TYSON $800: (Neil deGrasse Tyson shows an astronomical animation on the monitor.) This planet is in the sun's habitable zone, but thick clouds of carbon dioxide trap solar radiation making it the hottest in our solar system Venus |
| #7433, aired 2016-12-28 | IT'S AN EMERGENCY! $1000: A phenomenon called odor fade can make this dangerous home event harder to detect a natural gas leak |
| #7431, aired 2016-12-26 | GEOGRAPHIC EXTREMES $400: The lowest point in both the western & southern hemispheres is Laguna del Carbon in this nation's Patagonia region Argentina |
| #7426, aired 2016-12-19 | SCIENCE NEWS $1600: During the Industrial Rev., peppered moths evolved from light to black due to this 4-letter carbon residue soot |
| #7395, aired 2016-11-04 | AUTO SHOP TALK $200: (Kelly of the Clue Crew shows an automotive animation on the monitor.) In a car's catalytic converter, exhaust fumes go through reduction, then oxidation occurs using catalysts such as platinum & palladium filters; for example, one extra oxygen molecule converts a toxic gas into this harmless gas carbon dioxide |
| #7382, aired 2016-10-18 | PLANET EARTH $400: Burning coal & oil in the Industrial Age has produced this, atomic No. 6--mix it with oxygen & you get a greenhouse gas carbon |
| #7316, aired 2016-06-06 | KITCHEN TERMS DEFINED $600: The name of these fatty acids means they have a double bond at the 3rd carbon atom from the end omega-3 |
| #7270, aired 2016-04-01 | BACKSTAGE AT THE THEATRE $1600: A rumble pot is a receptacle in which hot water is mixed with this, solid carbon dioxide, to create fog dry ice |
| #7263, aired 2016-03-23 | RECENT SCIENCE $400: Using a process powered by the sun, chemists at GWU are capturing this greenhouse gas & turning it into nanofibers carbon dioxide |
| #7197, aired 2015-12-22 | ELEMENTARY SCHOOL $200: The chemical element that by definition all organic compounds contain carbon |
| #7185, aired 2015-12-04 | WILL YOU REMEMBER ME? $800: One of the selections on your email originally referred to a duplicate created with this type of office supply carbon copy |
| #7151, aired 2015-10-19 | SCIENCE & GEOMETRY $800: The first electric light was an arc lamp with two rods of this element carbon |
| #7141, aired 2015-10-05 | COLOR MY WORLD $400: The main culprit in the greenhouse effect that's causing global warming is the rise of this gas in the atmosphere carbon dioxide |
| #7140, aired 2015-10-02 | CYCLE ANALYSIS $1200: (Jimmy of the Clue Crew shows a diagram on the monitor.) Living cells get their fuel by converting sugars & acids to carbon dioxide & energy via this 8-step cycle named for a biochemist the Krebs cycle |
| #7120, aired 2015-07-24 | WATER SCIENCE $400: Mineral water from natural springs usually has a high level of carbonate of this chemical element calcium |
| #7110, aired 2015-07-10 | TIME FOR YOUR FORMULA $3,700 (Daily Double): You know the drill--WC is this carbide tungsten carbide |
| #7104, aired 2015-07-02 | ANIMALS, VEGETABLES, MINERALS $400: The "lead" in pencils is actually clay mixed with this mineral, a form of carbon graphite |
| #7099, aired 2015-06-25 | THE DESOLATION OF SMOG $1600: The EPA has a smog rating of tailpipe emission chemicals like carbon monoxide & HCHO, this specimen-preserving fluid formaldehyde |
| #7098, aired 2015-06-24 | IT'S HYPHENATED $1600: Making no net contribution to the amount of CO2 in the atmosphere carbon-neutral |
| #7075, aired 2015-05-22 | FAMOUS NAMES $1000: This engineer & inventor gave his name to a form of carbon composed of hollow geodesic spherical molecules (Buckminster) Fuller |
| #7067, aired 2015-05-12 | PHYSICAL SCIENCE $1600: Willard Libby won a 1960 Nobel Prize for developing the use of this number isotope of carbon to gauge the age of fossils carbon-14 |
| #7045, aired 2015-04-10 | DICTIONARY OF SCIENCE $800: "O" is for this gasoline additive with 8 single-bonded carbon atoms octane |
| #7021, aired 2015-03-09 | THE SCIENCE OF SECURITY $800: (Sarah of the Clue Crew presents from Lawrence Livermore Nat'l Laboratory in Livermore, CA.) A new military uniform material under development protects personnel from chemical and biological weapons using CNTs or these nanotubes which close up like tiny pores during an attack carbon |
| #7013, aired 2015-02-25 | GOVERNMENT AWARDS & HONORS $400: (Jimmy of the Clue Crew holds a plaque.) If a company has buildings with low carbon emissions, it can get a plaque representing energy stars from this agency the EPA |
| #6996, aired 2015-02-02 | CARRY ON $1000: Good news! You can carry on perishables along with up to 5 pounds of this, solid carbon dioxide dry ice |
| #6978, aired 2015-01-07 | GREEN SCENE $800: (I'm Elon Musk, CEO of Tesla Motors.) By reducing greenhouse gas emissions, the use of electric vehicles like those being produced by Tesla Motors will go a long way towards reducing this individual measure of environmental impact first formulated in the 1990s a carbon footprint |
| #6974, aired 2015-01-01 | "O" SAY CAN YOU "C" $1600: Relating to entities having a carbon makeup organic |
| #6958, aired 2014-12-10 | AUSTRALIAN HISTORY $1200: In 2014 a new, more conservative government made Oz the world's first country to repeal a tax on emissions of this carbon |
| #6905, aired 2014-09-26 | GENERAL SCIENCE $400: (Kelly of the Clue Crew demonstrates with a beaker and candle.) Add vinegar to baking soda to create this gas; because it's heavier than air, when poured from a glass, it will extinguish a flame carbon dioxide |
| #6891, aired 2014-07-28 | CHEMICAL ELEMENTS $400: By mass, it's the most abundant element in the Earth's crust & in your body oxygen |
| #6891, aired 2014-07-28 | CHEMICAL ELEMENTS $2,200 (Daily Double): The Roman numeral for 100 is also the symbol for this element carbon |
| #6883, aired 2014-07-16 | A CHEMISTRY SET $800: By definition this type of chemistry deals with the reactions & properties of all the elements except carbon inorganic |
| #6880, aired 2014-07-11 | 18th CENTURY SCIENTISTS $1600: Scottish chemist Joseph Black identified this 2-word gas, which he called "fixed air" carbon dioxide |
| #6851, aired 2014-06-02 | EASY BEING GREEN $2,000 (Daily Double): This city's 1997 protocol limits emissions of carbon dioxide, methane, nitrous oxide & other greenhouse gases Kyoto |
| #6841, aired 2014-05-19 | MAKING THE GRADE $200: The more than 3,000 grades of this metal can be categorized into carbon, alloy & stainless varieties steel |
| #6837, aired 2014-05-13 | DISCOVER $400: Near the top of the "100 Top Stories of 2013" was the announcement that atmospheric levels of this gas topped 400 ppm CO2 (carbon dioxide) |
| #6809, aired 2014-04-03 | ISOTOPES $1600: 99% of all carbon on Earth is this isotope, not 14 carbon-12 |
| #6807, aired 2014-04-01 | CERN $1200: (Jimmy of the Clue Crew delivers the clue from CERN in Geneva, Switzerland.) CERN's globe is a symbol of the Earth & sustainable development; its structure is wood, a material that minimizes the greenhouse effect due to its ability to store rather than emit this element carbon |
| #6805, aired 2014-03-28 | FOOTPRINTS $800: It's been defined as the amount of greenhouse gases released into the environment by a person or group a carbon footprint |
| #6798, aired 2014-03-19 | OXIDES $400: Early landers discovered Mars' atmosphere was 95% this gas carbon dioxide |
| #6751, aired 2014-01-13 | CHEMISTRY $2000: The buckyball, a stable, spherical molecule of this element, occurs naturally in soot carbon |
| #6739, aired 2013-12-26 | WHERE ARE "-U"? $1600: In this Southern California paradise at Carbon Beach, aka billionaire's beach Malibu |
| #6732, aired 2013-12-17 | ELEMENTAL ETYMOLOGY $200: 2 substances, borax & carbon, give us the name of this element used in nuclear control rods boron |
| #6726, aired 2013-12-09 | PERIODIC TABLE FOR 5 $1200: This nonmetallic element is found in all organic compounds as well as in all known forms of life carbon |
| #6723, aired 2013-12-04 | AFFLICTIONS OF YORE $1200: Illuminating gas poisoning had nothing to do with that second helping of pudding, but rather this gas, CO carbon monoxide |
| #6711, aired 2013-11-18 | NUCLEAR PHYSICS $200: You get a "C" for knowing the decay of isotopes of this element helps determine the age of very old plants carbon |
| #6683, aired 2013-10-09 | BIOSPHERE 2 $400: (Kelly of the Clue Crew reports from Biosphere 2 at the University of Arizona.) Rain & temperature are varied to see how they impact subterranean productivity in rainforests; root observation devices give researchers new understanding of the flow of this element, atomic No. 6, in the ecosystem carbon |
| #6672, aired 2013-09-24 | CNN ENVIRONMENT $400: (Anna Coren of CNN gives the clue from a hazy Beijing.) Beijing's air pollution has been somewhat improved thanks to more modern cars in the city, where a study has found a near doubling in ratio of carbon dioxide to this toxic product of inefficient combustion carbon monoxide |
| #6667, aired 2013-09-17 | POTENT POTABLES $1000: (Kathie Lee and Hoda give the clue.) French scientists say the best method of pouring champagne is down the side of the glass, which preserves up to twice as much of this gas, keeping the fizz in your bubbly carbon dioxide |
| #6662, aired 2013-07-30 | BALLOON TIME $2000: (Sarah of the Clue Crew shows us the clue in the lab with a balloon covering the neck of a bottle.) There's more than one way to blow up a balloon. When baking soda inside the balloon is released into a bottle of vinegar, it causes a bubbly chemical reaction and creates this gas that then inflates the balloon. carbon dioxide |
| #6660, aired 2013-07-26 | AMERICA'S CUP RACING $800: (Jimmy of the Clue Crew delivers the clue.) Instead of a traditional fabric sail on a mast, vessels like the AC45 use a wing sail, a rigid structure predominantly made from this elemental fiber for its greater strength & lighter weight carbon fiber |
| #6645, aired 2013-07-05 | SCIENCE 101 $2000: Among the world's lightest solids are carbon aerogels, nicknamed "frozen" this smoke (air accepted) |
| #6641, aired 2013-07-01 | NEXT IN ORDER $3,000 (Daily Double): On the periodic table:
boron, carbon, nitrogen... oxygen |
| #6636, aired 2013-06-24 | 6-LETTER ELEMENTS $400: Vital for life, it forms more compounds than all the other elements combined carbon |
| #6604, aired 2013-05-09 | FAST FOOD, FAST $400: Tacos del Carbon Del Taco |
| #6595, aired 2013-04-26 | ELEMENTS IN THE HUMAN BODY $400: As it makes up 18% of us, humans are described as life-forms "based" on this element carbon |
| #6588, aired 2013-04-17 | SWITZERLAND $1600: (Kelly of the Clue Crew visits a cheese stand in Switzerland.) Emmental, which is basically synonymous with Swiss cheese, gets its recognizable look from these microorganisms; they ferment lactic acid into the carbon dioxide that make the holes bacteria |
| #6580, aired 2013-04-05 | CHEMISTRY $2000: AMU stands for this "unit" based on the isotope carbon-12 atomic mass unit |
| #6576, aired 2013-04-01 | PAPER $600: (Jimmy of the Clue Crew presents the clue.) Rarely used in the Computer Age, it's the "elemental" method I used to make this copy carbon copying |
| #6565, aired 2013-03-15 | SECOND ROCK FROM THE SUN $800: Venus' atmosphere is 96% this compound that makes up just .037% of Earth's; no wonder its globe has warmed carbon dioxide |
| #6547, aired 2013-02-19 | THE FUTURE $400: (Al Gore gives the clue.) Looking to the future, we can't ignore the climate crisis as we've done too often since back in 1859 when an Irish scientist noted the heat-trapping effect of this molecule carbon dioxide |
| #6523, aired 2013-01-16 | CRACKLE $800: When Pop Rocks candies come into contact with moisture, this gas is released, causing them to fizz & crackle carbon dioxide |
| #6500, aired 2012-12-14 | CHEMISTS $800: Melvin Calvin won a Nobel Prize for using carbon-14 to map the chemical reactions in this plant process photosynthesis |
| #6492, aired 2012-12-04 | NUCLEAR ENERGY $800: The 1st controlled nuclear reaction was produced in 1942 by using uranium & uranium oxide embedded in this soft carbon graphite |
| #6490, aired 2012-11-30 | THE CDC SAYS $1000: To prevent this type of poisoning, don't use "gasoline or charcoal-burning" devices "inside your home" carbon monoxide |
| #6474, aired 2012-11-08 | FIZZ ED $400: Carbonation is the phenomenon in which this gas is suspended in liquid, creating small bubbles or fizz carbon dioxide |
| #6465, aired 2012-10-26 | LET'S HAVE A "BALL" $2000: Named for a famous engineer & inventor, it's a round molecule with 60 carbon atoms a buckyball |
| #6406, aired 2012-06-25 | "D" SCIENCE $800: (Jimmy of the Clue Crew presents the clue.) The bubble floats because the smoke that's produced from this form of carbon dioxide that was added to the water is heavier than the air around the bubble, but less dense than the air inside it dry ice |
| #6406, aired 2012-06-25 | MINE $800: These birds are sensitive to methane & carbon monoxide, which explains their use in a coal-mining phrase a canary |
| #6402, aired 2012-06-19 | IRON, MAN $400: The most common form of steel is named for this element that alloys with the iron carbon |
| #6385, aired 2012-05-25 | FUN WITH ELEMENTS $1200: It occurs in more different forms than any other element on the periodic table-- more than 10 million carbon |
| #6374, aired 2012-05-10 | MAY I HAVE SECONDS? $400: The basis for all proteins, fats & carbohydrates, this element makes up the 2nd-largest amount of you by mass carbon |
| #6347, aired 2012-04-03 | POISON $1600: In 1935 actress Thelma Todd was found in her car, dead of this type of poisoning under unexplained circumstances carbon monoxide |
| #6340, aired 2012-03-23 | HYPHENATED TERMS $3,200 (Daily Double): Willard Libby developed a method of this, used to determine the age of fossils & the like carbon-dating |
| #6315, aired 2012-02-17 | THAT'S NOT GNEISS! $800: Better be good if you don't want a stocking full of this carbon-rich stuff coal |
| #6312, aired 2012-02-14 | ENDS IN "GHT" $1600: Outdoor furniture made from this low-carbon form of iron dates back to ancient Rome wrought iron |
| #6311, aired 2012-02-13 | THE ELEMENTS OF STYLE? $800: If blue or black aren't scientific enough for you, you can get jeans in the color of this element, C carbon |
| #6286, aired 2012-01-09 | WHAT'S NEXT? $800: On the periodic table:
Carbon, nitrogen, this oxygen |
| #6253, aired 2011-11-23 | AS I RECALL $800: In 2010 Legacy propane infrared plaque heaters were recalled due to the chance of poisoning by this odorless gas carbon monoxide |
| #6249, aired 2011-11-17 | AIRSHIPS $400: In 2011 this firm announced it was phasing out its blimps in favor of rigid airships with aluminum & carbon skeletons Goodyear |
| #6239, aired 2011-11-03 | CARBON CREDITS $400: This gas, CO, prevents hemoglobin from supplying oxygen to the body carbon monoxide |
| #6239, aired 2011-11-03 | CARBON CREDITS $800: This 2-word study of living things is primarily devoted to carbon compounds organic chemistry |
| #6239, aired 2011-11-03 | CARBON CREDITS $1200: AKA black lead, this form of carbon has a greasy feel & is used in making lubricants graphite |
| #6239, aired 2011-11-03 | CARBON CREDITS $1600: This carbon isotope, 2 down from radiocarbon, is the standard for the relative atomic mass of other elements C-12 (or carbon-12) |
| #6239, aired 2011-11-03 | CARBON CREDITS $2000: The atoms in a diamond are arranged in this "4-faced" pyramid-shaped pattern, giving it a rigid structure tetrahedral |
| #6209, aired 2011-09-22 | CHEMISTS $400: He improved a smokeless lab burner & in 1841 invented the carbon-zinc electric cell (Robert) Bunsen |
| #6199, aired 2011-07-21 | THE HUMAN BODY $1000: In the average human body there is enough of this element, atomic no. 6, to make about 900 pencils carbon |
| #6177, aired 2011-06-21 | INTERNATIONAL YEAR OF CHEMISTRY $800: You exhale this gas first identified by British scientist Joseph Black in the 1750s carbon dioxide |
| #6174, aired 2011-06-16 | FUN WITH ELEMENTS $200: The name of this element begins with a synonym for "automobile" carbon |
| #6155, aired 2011-05-20 | CARS OF THE FUTURE PRESENT $800: (Sarah of the Clue Crew reports from the Argonne National Laboratory in Chicago, IL.) The Argonne National Laboratory dynamometer can measure both a car's particulate production & its fuel efficiency--the latter by simulating road stresses & measuring the products of this element in the engine's emissions carbon |
| #6139, aired 2011-04-28 | SPORTS SCIENCE $1200: (Sarah of the Clue Crew gives the clue from the Gatorade Sports Science Institute in Barrington, IL.) The concentration of these two expired gases determined by a metabolic chart tells athletes how many carbs as opposed to fat they're burning; burning a higher percentage of fat increases endurance oxygen & carbon dioxide |
| #6132, aired 2011-04-19 | THE MAD TEA PARTY $400: The Tea Party is mad at government programs, like the cap & trade system meant to reduce this element carbon |
| #6129, aired 2011-04-14 | FORMULA2 $1000: (Kelly of the Clue Crew shows some structural formulas on the monitor.) Alkanes are organic compounds that have carbon atoms arranged in a row; C2H6 is ethane; add one carbon & two hydrogens to get C3H8, this backyard barbecue staple propane |
| #6096, aired 2011-02-28 | YOUNG NOBEL PRIZE WINNERS $3,000 (Daily Double): Konstantin Novoselov, 36, shared the 2010 Physics Prize for his work on graphene, a form of this element carbon |
| #6089, aired 2011-02-17 | CHEMISTRY $600: Around 1630 Jan van Helmont discovered this gas given off by burning wood & called it gas sylvestre carbon dioxide |
| #6082, aired 2011-02-08 | DIAMONDS ARE FOREVER $700 (Daily Double): Under intense heat & in the presence of oxygen, a diamond will burn & form this gas carbon dioxide |
| #6072, aired 2011-01-25 | PARTS OF THE WHOLE $800: Grip,
shaft,
a head made of stainless steel, titanium, carbon graphite... golf club |
| #6061, aired 2011-01-10 | THE "CAR" POOL $800: It's No. 6 on the periodic table carbon |
| #6016, aired 2010-11-08 | IT'S ELEMENTAL, MY DEAR $400: Like diamond & graphite, fullerene is a form of this element carbon |
| #6004, aired 2010-10-21 | DYNO-"ITE" $600: This pencil component is a form of soft carbon; you won't get lead poisoning from chewing on it graphite |
| #5972, aired 2010-07-27 | FERROUS, BUELLER $400: Iron is extracted by this 8-letter industrial process with carbon & limestone; I'm this process! Thiiiis processss... smelting |
| #5957, aired 2010-07-06 | SCIENCE CLASS $800: During this plant process, carbon dioxide & water combine with light energy to create oxygen & glucose photosynthesis |
| #5932, aired 2010-06-01 | FOOD SCIENCE $400: (Sarah of the Clue Crew shows a slice of bread toasted to golden brown.) Toasting bread is actually a chemical reaction where this element, from the Latin for "charcoal", is released from the starch & sugar during the heating process carbon |
| #5928, aired 2010-05-26 | ECO SUAVE $200: Recent studies in Oman & New Guinea have discovered peridotite rocks that can absorb tons of this major greenhouse gas carbon dioxide |
| #5927, aired 2010-05-25 | "ALLO" DARLIN' $600: As it's composed of iron & carbon, steel is one of these an alloy |
| #5881, aired 2010-03-22 | EARTH SCIENCE $1200: (Jimmy of the Clue Crew shows an atomic diagram on the monitor.) Used to date artifacts because it has a half-life of 5,730 years, this isotope has 6 protons & 8 neutrons in its nucleus carbon-14 |
| #5875, aired 2010-03-12 | FOUND IN THE JEOPARDY! ATTIC $400: If the heat goes out, we could always burn our piece of this hard, high-carbon type of coal anthracite |
| #5854, aired 2010-02-11 | WE'VE GOT CHEMISTRY $800: The field of inorganic chemistry studies substances that contain little or none of this element carbon |
| #5799, aired 2009-11-26 | FEMALE INVENTORS $1,000 (Daily Double): Several of Beulah Henry's inventions dealt with this machine, like the protograph, which made 4 copies with no carbon paper a typewriter |
| #5739, aired 2009-07-16 | LET'S "CH"AT $400: It's the form of carbon your dad probably uses when he fires up the barbecue charcoal |
| #5701, aired 2009-05-25 | TIME'S TOP 10 EVERYTHING OF 2008 $1000: No. 9 in "Green Stories":
"Northeastern utilities bid $38.5 million for the right to emit 12.5 tons of" this carbon dioxide |
| #5692, aired 2009-05-12 | FUN WITH SCIENCE $800: Add 4 tbsp, vinegar & 3 tbsp. baking soda to a glass of water & this gas will make raisins bounce in it carbon dioxide |
| #5682, aired 2009-04-28 | LIFE SCIENCES $400: Organic chemistry focuses specifically on this element's compounds & their reactions carbon |
| #5668, aired 2009-04-08 | THIS WILL SLAY YOU $1000: (Alex reports from a swordsmith shop in Tokyo, Japan.) The sword maker must be careful to get the proper amount of this element in his steel to ensure proper hardness; too much of it, however, & the sword becomes brittle carbon |
| #5658, aired 2009-03-25 | EMAIL ETIQUETTE $1000: If not all the recipients know each other, don't give out their addresses--use bcc, short for this blind carbon copy |
| #5647, aired 2009-03-10 | THE ENVIRONMENT $2000: Your carbon one isn't made with your shoe but your lifestyle; calculate it at www.nature.org your footprint |
| #5638, aired 2009-02-25 | SCIENCE $2000: (Jimmy of the Clue Crew presents the clue.) Carbon, one of the most common elements, has been discovered in 60-atom configurations called these, named for an architect buckyballs (fullerenes) |
| #5625, aired 2009-02-06 | COMPOUNDS $1600: By definition, a carbide is a compound of carbon & this type of substance metal |
| #5624, aired 2009-02-05 | BASIC SCIENCE $1600: Graphite is a soft form of this element carbon |
| #5611, aired 2009-01-19 | SCIENCE FACT $400: As seen on the Internet, dropping Mentos into diet soda releases this gas out of suspension, creating a geyser carbon dioxide |
| #5609, aired 2009-01-15 | MISSING ELEMENTS $2000: Methanol:
____H3OH carbon |
| #5592, aired 2008-12-23 | ELEMENTARY SPELLING $2000: Neon,
carbon,
potassium neck |
| #5591, aired 2008-12-22 | AHH, LIVER! $200: Inhalation of certain chemicals, like carbon tetrachloride, as well as boozing, can cause this liver disease cirrhosis |
| #5559, aired 2008-11-06 | SPEED METAL $1600: An iron-carbon alloy of less than 2% carbon stainless steel |
| #5552, aired 2008-10-28 | CRAYOLA: A COLORFUL HISTORY $1200: (Sarah of the Clue Crew stands with machinery at the Crayola Museum & Factory in Easton, PA.) Edwin Binney & this cousin of his began their partnership in 1885 to sell carbon black & other pigments; Crayolas didn't come until 1903 (Harold) Smith |
| #5535, aired 2008-10-03 | ARCHAEOLOGY $1600: In the 1940s chemist Willard Libby discovered this method of dating ancient artifacts carbon-14 dating |
| #5526, aired 2008-09-22 | RACING BIKES $800: (Jon of the Clue Crew holds a bicycle frame at Trek Bicycle Corporation in Waterloo, WI.) Trek uses a proprietary method of optimum compaction & low void to maximize strength & minimize weight of frames & parts made of this element carbon |
| #5520, aired 2008-09-12 | SCIENCE $5,000 (Daily Double): Sugars, alcohols & starches are all formed by different combos of these 3 elements hydrogen, carbon & oxygen |
| #5514, aired 2008-07-24 | SCRIPPS INSTITUTION OF OCEANOGRAPHY $200: (Sarah of the Clue Crew reports from a beach UC San Diego's Scripps Institution of Oceanography.) In 1958, Scripps scientist Charles Keeling began using flasks to measure this gas in the atmosphere; the "Keeling curve" is a symbol of climate change carbon dioxide |
| #5513, aired 2008-07-23 | GEOLOGY $800: This radioactive isotope is used to date rocks from 100 to 50,000 years old carbon-14 |
| #5502, aired 2008-07-08 | SCIENCE $600: (Cheryl of the Clue Crew performs a science experiment.) By mixing baking soda, a chemical base, with the acid in the lime juice, this gas is produced, resulting in a bubbly liquid carbon dioxide |
| #5488, aired 2008-06-18 | LEAD $1000: The "lead" used in pencils is actually this form of carbon once thought to be a type of lead graphite |
| #5469, aired 2008-05-22 | CHEMISTRY $400: 2007 Nobel laureate Gerhard Ertl has studied the conversion of this monoxide to this dioxide, as in cars carbon |
| #5418, aired 2008-03-12 | BOTANY $400: The long leaves of the milfoil plant are especially suited to absorb this gas underwater carbon dioxide |
| #5385, aired 2008-01-25 | MY CHEMICAL ROMANCE $800: A granular activated version of this element is used in filters for gas masks & fish tanks carbon |
| #5380, aired 2008-01-18 | 13-LETTER WORDS $1200: (Jon of the Clue Crew plop, plops 2 tablets in a glass; they fizz, fizz.) When you drop Alka-Seltzer in water, a series of reactions, including the release of carbon dioxide, creates this bubbly effect, from the Latin for "begin to boil" effervescence |
| #5340, aired 2007-11-23 | BIOLOGY $400: Stomata, leaf pores that take in this gas, enlarge when its level in the air drops below normal carbon dioxide |
| #5338, aired 2007-11-21 | AIR $200: In U.S. cities, 95% of this air pollutant comes from incomplete combustion in vehicles carbon monoxide |
| #5331, aired 2007-11-12 | VIRTUAL MEDICINE $600: (Sarah of the Clue Crew reads next to a doctor inserting a large syringe into a simulated abdomen.) This gas that's eliminated during respiration is what gets pumped into the abdomen to expand it & give surgeons room to work carbon dioxide |
| #5330, aired 2007-11-09 | THE NEW YORK TIMES BUSINESS $800: Times Business viewed skeptically Rep. John Dingell's proposed anti-global warming tax on this element carbon |
| #5317, aired 2007-10-23 | DID YOU PLANET THAT WAY? $1600: In 2005 NASA experimented with a low-pressure greenhouse to grow plants on this carbon dioxide-rich planet Mars |
| #5302, aired 2007-10-02 | IT'S A GAS! $1600: (Kelly of the Clue Crew demonstrates.) To make a simple fire extinguisher, just put some vinegar in baking soda & the chemical reaction produces this gas, which will put out a flame carbon dioxide |
| #5291, aired 2007-09-17 | THE ELEMENTS $2000: Harold Kroto & others found this common element had a new molecular form, the Fullerene carbon |
| #5248, aired 2007-06-06 | FAMOUS FLOPS $600: Businesses stuck with carbon paper because this company's 1949 Model A was slow, messy & hard to use the Xerox |
| #5236, aired 2007-05-21 | TERMS OF ENGINEERMENT $800: When burned with oxygen, this gas, C2H2, burns so hot it can weld iron & cut steel acetylene |
| #5174, aired 2007-02-22 | THE HUMAN ELEMENT $800: By weight you're 65% this element oxygen |
| #5174, aired 2007-02-22 | THE HUMAN ELEMENT $1,400 (Daily Double): A 300-pounder contains 54 pounds of this building block of life carbon |
| #5121, aired 2006-12-11 | YOU'VE GOT OUR NUMBER $1000: The EPA doesn't want kids breathing air with more carbon monoxide than 9 parts per this million |
| #5062, aired 2006-09-19 | LET'S MAKE THIS $800: To make a diamond, apply a lot of pressure to this element--a lot of pressure! carbon |
| #5049, aired 2006-07-20 | COAL RIDGE $800: The "hard" glossy black coal that's mined with the highest fixed carbon content is this type anthracite |
| #5049, aired 2006-07-20 | WORD'S WORTH $2000: 6 letters,
score 24:
Composed of silicon dioxide, it's the most abundant mineral on Earth's surface quartz |
| #5022, aired 2006-06-13 | GEOLOGY $2,000 (Daily Double): If your burn a diamond in the presence of oxygen, it will form this gas carbon dioxide |
| #5013, aired 2006-05-31 | PHYSICAL SCIENCE $5,000 (Daily Double): (Jon of the Clue Crew explains the diagrams on the monitor.) For 5 out of 10 carbon-11 atoms to decay into boron-11, it takes 20 minutes, which is this measure for the carbon-11 isotope the half-life |
| #4989, aired 2006-04-27 | SLOW DOWN $600: This gas is causing the explosive reaction seen here CO2 (carbon dioxide) |
| #4974, aired 2006-04-06 | THE ELEMENTS $5,200 (Daily Double): The Venus' flytrap catches & digests insects mainly to absorb this element nitrogen |
| #4969, aired 2006-03-30 | THE PERIODIC TABLE OF ELEMENTS $400: In "The Periodic Table" by Primo Levi, a Holocaust survivor, the last chapter is on this element on which life is based carbon |
| #4928, aired 2006-02-01 | INVENTORS $200: Shortly after establishing a lab in Menlo Park, N.J., he invented the carbon telephone transmitter Edison |
| #4869, aired 2005-11-10 | I KNOW WHAT YOU DID LAST SUMMER $800: You went to summer school to take this branch of science that deals specifically with compounds of carbon organic chemistry |
| #4838, aired 2005-09-28 | ELEMENTARY, MY DEAR $200: Rock on! All diamonds consist primarily of this element carbon |
| #4799, aired 2005-06-16 | I'LL GO MINE $2000: To save money on a ring, I'll go mine this form of carbon seen here & make a synthetic diamond graphite |
| #4784, aired 2005-05-26 | CHEMISTRY $2000: Number of hydrogen atoms it takes to equal the weight of one carbon atom 12 |
| #4778, aired 2005-05-18 | CHEMISTRY $800: In 1947 Willard Libby perfected the archaeological dating method named for this isotope carbon-14 |
| #4765, aired 2005-04-29 | THAT'S ELEMENT-ARY $1000: One atomic mass unit equals 1/12 the mass of an atom of the most common isotope of this element carbon |
| #4764, aired 2005-04-28 | THE KENNEDY SPACE CENTER $200: (Sarah of the Clue Crew reports from Kennedy Space Center, Florida.) For plants which may go into space, the Life Sciences Lab studies the effect of light, temperature & this gas formed in respiration carbon dioxide |
| #4733, aired 2005-03-16 | MAD ABOUT SCIENTISTS $1000: The buckminsterfullerine is a giant molecule of this that resembles a geodesic dome or a soccer ball carbon |
| #4731, aired 2005-03-14 | BIOLOGY $800: C4 plants, which photosynthesize molecules having 1 more of these atoms than C3 plants, do better if it's hot & dry carbon |
| #4708, aired 2005-02-09 | GOOD CONDUCTORS $800 (Daily Double): This form of carbon used in fishing rods is a good conductor--so cast with care around power lines graphite |
| #4698, aired 2005-01-26 | I'M GETTING SPACED OUT! $2,000 (Daily Double): If we were on Mars, the atmosphere would be incredibly thin, consisting mainly of this gas carbon dioxide |
| #4676, aired 2004-12-27 | SCIENCE $1200: In the 1970s it was found that when CFCs break down, this is the main 1 of the 3 elements in them that harms the ozone chlorine |
| #4671, aired 2004-12-20 | COMMON BONDS $800: A bride's rock;
the core of a pencil;
briquets things that are made from carbon |
| #4670, aired 2004-12-17 | NEXT STOP, VENUS $1,400 (Daily Double): Contributing to its high temperature, Venus' atmosphere is predominantly made up of this gas carbon dioxide |
| #4645, aired 2004-11-12 | BETTER LIVING THROUGH CHEMISTRY $1600: The tingle on your tongue from drinking soda comes from the release of protons from this compound carbon dioxide |
| #4639, aired 2004-11-05 | SUNSHINE $400: Green plants use the Sun's rays to turn water & this gas into carbohydrates carbon dioxide |
| #4635, aired 2004-10-29 | DUDE, WHERE'S MY CARB? $1000: Carbohydrates are predominantly made up of these three elements carbon, hydrogen & oxygen |
| #4631, aired 2004-10-25 | CROSSWORD CLUES "C" $1200: An exact duplicate
(6, 4) carbon copy |
| #4630, aired 2004-10-22 | GENERAL SCIENCE $1200: Dry ice is made by compressing and cooling this gas carbon dioxide |
| #4627, aired 2004-10-19 | THE NIGHTTIME SKY $400: In 1986 it was discovered that this famous comet was about 80% ice & 15% frozen carbon dioxide Halley's Comet |
| #4608, aired 2004-09-22 | AROUND THE CELL $400: 6 elements make up 99% of a cell's weight: carbon, nitrogen, phosphorus, sulfur & these familiar 2 hydrogen & oxygen |
| #4596, aired 2004-09-06 | TRANSPORTATION $1600: The U.S. company Trek makes Lance Armstrong's bikes from a composite of this often-compounded element carbon |
| #4552, aired 2004-05-25 | DUDE, WHERE'S MY "CAR"? $1600: Isotope used to date archaeological specimens carbon-14 |
| #4551, aired 2004-05-24 | SCIENCE & NATURE $800: Lignite, a low-grade type of this rock, is only about 30 percent carbon coal |
| #4518, aired 2004-04-07 | IT'S A GAS $1200: Automobiles are equipped with catalytic converters that convert carbon monoxide into this gas carbon dioxide |
| #4478, aired 2004-02-11 | GENERAL SCIENCE $2000: In 1985 a new carbon molecule, shaped like a geodesic dome, was discovered & named for this designer Buckminster Fuller |
| #4458, aired 2004-01-14 | CLARK BAR $400: This "Bandstand" & "Pyramid" host didn't help build the pyramids'; the almanac only carbon-dates him back to 1929 Dick Clark |
| #4423, aired 2003-11-26 | U.S. PLACE NAMES $1200: This New Jersey city is named for the man who invented the carbon telephone transmitter in 1877 Edison |
| #4418, aired 2003-11-19 | BIOLOGY $2000: (Cheryl of the Clue Crew presents in front of a blackboard.) A 2-carbon compound & protein are converted to CO2 & water in this cycle that turns food into energy the Krebs cycle |
| #4393, aired 2003-10-15 | SCIENCE BRIEFS $1,000 (Daily Double): This element's name is from the Latin for "charcoal" carbon |
| #4389, aired 2003-10-09 | GAS $1600: The atmosphere of Venus, the heaviest of any planet, is mainly this common gas 1.5 times heavier than air carbon dioxide |
| #4382, aired 2003-09-30 | ORGANIC CHEMISTRY $400: (Jimmy of the Clue Crew presents in front of a blackboard.) Atoms in the compound carbon dioxide share 2 pairs of electrons, forming a double covalent this bond |
| #4380, aired 2003-09-26 | YUM YUM! $1000: Pop Rocks pop in your mouth because they contain bubbles of this gas carbon dioxide |
| #4369, aired 2003-09-11 | OVERNIGHT DELIVERY $800: 2-word name for solid carbon dioxide, useful for shipping perishables like fish dry ice |
| #4323, aired 2003-05-21 | MINERALS $4,200 (Daily Double): German geologist Abraham Werner gave this mineral its name, derived from a Greek word for "to write" graphite |
| #4321, aired 2003-05-19 | PHYSICAL SCIENCE $400: If a recipe told you to bring carbon to this point, you'd need to raise its temperature to 8,720 degrees the boiling point |
| #4321, aired 2003-05-19 | HOW ODD! $600: It's the only precious gem composed of only one element diamond (carbon) |
| #4301, aired 2003-04-21 | FAMOUS FIRSTS $400: Pre-Xerox, in 1806 Ralph Wedgwood came up with this "apparatus for producing duplicates of writing" carbon paper |
| #4280, aired 2003-03-21 | WYOMING $600: Carbon County really digs this solid fuel, really coal |
| #4265, aired 2003-02-28 | CHEMISTRY CLASS $200: This man whose name is on a laboratory burner invented a carbon-zinc electric cell Robert Bunsen |
| #4264, aired 2003-02-27 | THE BAD AIR UP THERE $400: You can't see or smell this gas produced by gas engines, but inhaling it will make you dizzy carbon monoxide |
| #4242, aired 2003-01-28 | NOBEL PRIZE WINNERS $1600: Willard Libby won a Chemistry prize for his method of using this radioactive isotope to date fossils & other objects carbon-14/radiocarbon |
| #4223, aired 2003-01-01 | ROCKS & MINERALS $2,000 (Daily Double): Around 1920 plates of this silicon mineral were first used to control radio frequencies quartz |
| #4221, aired 2002-12-30 | ALLOYS $400: Simple carbon steels are just a little carbon & manganese & a lot of this iron |
| #4168, aired 2002-10-16 | PAPER $800: This office supply dates back to 1806
This office supply dates back to 1806 carbon paper |
| #4166, aired 2002-10-14 | THIS CATEGORY DOESN'T STINK $400: 2 odorless ingredients in your Pepsi are caffeine & this gas that gives it bubbles carbon dioxide |
| #4158, aired 2002-10-02 | IT'S A GAS $1200: In March 2001 President Bush decided not to begin regulating emissions of this from power plants carbon dioxide |
| #4151, aired 2002-09-23 | WHAT GRADE DID YOU GET? $200: Anthracite, the highest grade of this, is made almost entirely of carbon coal |
| #4146, aired 2002-09-16 | ELEMENT-ARY SCHOOL $1200: Diamonds & graphite are both forms of this element carbon |
| #4098, aired 2002-05-29 | CHEMISTRY EXPERIMENTS $200: You can use these, made by blowing soap film through a wand, to detect carbon dioxide bubbles |
| #4057, aired 2002-04-02 | PHYSICAL SCIENCE $800: The simplest organic compounds are made of just carbon & this element hydrogen |
| #4040, aired 2002-03-08 | DIAMONDS $1000: If a diamond is subjected to intense heat in the form of oxygen, it will burn & form this gas carbon dioxide |
| #4031, aired 2002-02-25 | YOUR BETTER ELEMENTS $400: This element that makes you organic is part of your proteins as well as your fats carbon |
| #4025, aired 2002-02-15 | SCIENCE $800: (Cheryl does a demonstration.) It's a little foggy to me, but dry ice is nothing more than this gas solidified carbon dioxide |
| #3995, aired 2002-01-04 | CHEMISTRY $800: The carbon dioxide molecule contains this many oxygen atoms 2 |
| #3990, aired 2001-12-28 | HICCUP CURES $800: Breathe into a bag for a minute; this gas, CO2, can disrupt the nerve impulses which cause hiccups carbon dioxide |
| #3969, aired 2001-11-29 | THE CIRCULATORY SYSTEM $200: Carbon dioxide is swapped for oxygen in the alveoli of these organs lungs |
| #3862, aired 2001-05-22 | GETTING SCIENTIFIC $200: It's the more common name for frozen carbon dioxide Dry ice |
| #3834, aired 2001-04-12 | WHY? $500: Because bacteria from carbon dioxide bubbles around which the curd hardens Why does Swiss cheese have holes? |
| #3829, aired 2001-04-05 | ALL GOD'S CREATURES $600: Algae make their own food from carbon dioxide & water by this process photosynthesis |
| #3799, aired 2001-02-22 | AFRICAN AMERICANS $100: Lewis Latimer developed a carbon filament for this device & later worked for its inventor Light bulb |
| #3794, aired 2001-02-15 | THE ELEMENTS $800: To make element 104, scientists in Berkeley bombarded this home state element, No. 98, with carbon, No. 6 Californium |
| #3793, aired 2001-02-14 | GLOBAL WARMING $800: It's not so "funny" that this gas, N2O, traps 270 times more heat than carbon dioxide nitrous oxide (laughing gas) |
| #3766, aired 2001-01-08 | WAR GAMES $300: Small balls filled with colored liquid are fired by carbon dioxide in this battle of wills Paintball |
| #3759, aired 2000-12-28 | PLAYING WITH FIRE $800 (Daily Double): With fire, iron & carbon are forged into this strong alloy steel |
| #3752, aired 2000-12-19 | CHEMISTRY $400: It's the branch of chemistry generally concerned with non-carbon elements & their compounds Inorganic chemistry |
| #3748, aired 2000-12-13 | ELSEWHERE IN 1776 $400: This gas produced by car engines was first produced in a lab by a French scientist in 1776 Carbon monoxide |
| #3748, aired 2000-12-13 | THE MOLECULAR WORLD $800: Alkane molecules contain carbon-carbon single ones; alkenes contain carbon-carbon double ones Bonds |
| #3743, aired 2000-12-06 | ELEMENTAL NAMES $200: This element's name is derived from the names of 2 other substances: borax & carbon Boron |
| #3732, aired 2000-11-21 | SIMPLE SCIENCE $500 (Daily Double): (Here is our science guy, Bill Nye) It's the gas produced by adding vinegar, an acid, to sodium bicarbonate Carbon dioxide |
| #3729, aired 2000-11-16 | CHEMISTRY $200: Carbon in this form has every atom linked tetrahedrally to 4 others, making it really hard Diamond |
| #3698, aired 2000-10-04 | SCIENCE & NATURE $400: Animals exhale this gas during respiration carbon dioxide |
| #3630, aired 2000-05-19 | ANATOMY $300: Human lungs have millions of these tiny air sacs, where oxygen & carbon dioxide are exchanged alveoli |
| #3595, aired 2000-03-31 | DOWN TO EARTH $200: The Earth has water & oxygen cycles in addition to one for this element, the basis of organic life Carbon |
| #3562, aired 2000-02-15 | PRE-MED $600: General Chemistry:
It's the main branch of chemistry that deals with carbon compounds Organic chemistry |
| #3559, aired 2000-02-10 | BASEBALL WORDS $300: A highly prized form of carbon Diamond |
| #3491, aired 1999-11-08 | FAMILIAR MOLECULES $200: Take a deep breath & name this product of human respiration seen here Carbon dioxide (CO2) |
| #3463, aired 1999-09-29 | SCIENCE & NATURE $400: During this process, the opposite of photosynthesis, plants use oxygen & give up water & carbon dioxide Respiration |
| #3445, aired 1999-07-23 | ELEMENT SYMBOL SPELLING $1,200 (Daily Double): Nickel,
carbon,
potassium Nick (Ni C K) |
| #3390, aired 1999-05-07 | ...AND WE LIKED IT! $400: Until the photocopier, we always had stained fingers from the paper named for this element...& we liked it! Carbon |
| #3383, aired 1999-04-28 | PHYSICAL SCIENCE $100: Solid water is ice; solid carbon dioxide has this 2-word name dry ice |
| #3338, aired 1999-02-24 | IN THE TEENS $600: Like potassium-40, this radioactive isotope is used in archaeological dating carbon-14 |
| #3323, aired 1999-02-03 | THE ELEMENTS $400: In its pure form, this fundamental element can look like coal, or like glass Carbon |
| #3268, aired 1998-11-18 | PRESIDENTIAL ANAGRAMS $800: A CARBON HILLMAN Abraham Lincoln |
| #3224, aired 1998-09-17 | SCIENCE CLASS $100: By definition, organic compounds must contain atoms of this element Carbon |
| #3217, aired 1998-09-08 | SCIENTIFIC AMERICAN $800: Unselfishly, carbon generally forms these bonds in which atoms share their electrons Covalent bonds |
| #3209, aired 1998-07-09 | HOT TOPICS $200: Literally a "hot" topic, it's partly caused by greenhouse gases like carbon dioxide global warming |
| #3174, aired 1998-05-21 | WE GOT GOOD CHEMISTRY $400: This element is always in a carbide Carbon |
| #3170, aired 1998-05-15 | CARBON $200: This carbon compound found in auto exhaust can prevent body tissues from getting oxygen Carbon monoxide |
| #3170, aired 1998-05-15 | CARBON $400: This mineral is the most stable form of carbon, though not when you sharpen your pencil too fine Graphite |
| #3170, aired 1998-05-15 | CARBON $600: This isotope with a half-life of about 5,730 years is used to date organisms that didn't last quite so long Carbon 14 |
| #3170, aired 1998-05-15 | CARBON $800: The structures of compounds like this one, C6H6, have a certain "ring" to them Benzene |
| #3170, aired 1998-05-15 | CARBON $1000: Plant products called alkaloids contain carbon & this element, the next one up on the periodic table Nitrogen |
| #3147, aired 1998-04-14 | CHEM LAB $400: Gasoline is made up of hundreds of these, the simplest organic compounds hydrocarbons |
| #3147, aired 1998-04-14 | CHEM LAB $600: It's defined as the chemistry of substances that lack carbon bonds Inorganic chemistry |
| #3129, aired 1998-03-19 | IN THE AIR UP THERE $400: It's about .03% of the air; you breathe a little in & a lot out carbon dioxide |
| #3076, aired 1998-01-05 | A GIRL'S BEST FRIEND $100: Modern synthetic diamonds were first produced in 1954 by compressing this element under extreme pressure carbon |
| #3072, aired 1997-12-30 | ABBREV. $200: The cc on an office letter refers back to this now little-used office supply carbon copy (or carbon paper) |
| #3055, aired 1997-12-05 | TECHNOLOGY $500: In 1908 a carbon tetrachloride gas type of this was invented; in 1917 a foam type Fire extinguishers |
| #3033, aired 1997-11-05 | SODA POP QUIZ $300: This gas produced by fermentation gives soda its pop Carbon dioxide (CO2) |
| #3016, aired 1997-10-13 | CHEMISTRY $600: Reducing agents like carbon assist this process of extracting metal from ore at high temperatures Smelting |
| #3015, aired 1997-10-10 | BIOLOGY $400: It's the process by which an organism or cell takes in oxygen & expels carbon dioxide Respiration |
| #3008, aired 1997-10-01 | CONNECTIONS $200: It's the element shared by water & carbon dioxide oxygen |
| #2978, aired 1997-07-09 | BOTANY $400: This gas is produced by plants during photosynthesis Oxygen |
| #2972, aired 1997-07-01 | INVENTORS $200: This German chemist for whom a gas burner is named developed a zinc-carbon electric cell Robert Bunsen |
| #2950, aired 1997-05-30 | THE ELEMENTS $400: As a diamond, this element melts at about 6500 degrees F.; as graphite, it changes directly to a gas Carbon |
| #2931, aired 1997-05-05 | THE ELEMENTS $600: Diamond, the hardest known substance, is made of crystallized atoms of this element Carbon |
| #2930, aired 1997-05-02 | NUTRITION $3,000 (Daily Double): Antioxidants like beta carotene prevent cell damage by these products of oxygen breakdown free radicals |
| #2928, aired 1997-04-30 | GENERAL SCIENCE $1000: In the chemical formula for propane, C3H8, the H stands for hydrogen & the C stands for this element carbon |
| #2921, aired 1997-04-21 | THE ENVIRONMENT $600: This 1970 act set standards for major pollutants, including ozone & carbon monoxide Clean Air Act |
| #2911, aired 1997-04-07 | GASES $400: This poisonous gas, CO, is about 3% lighter than air carbon monoxide |
| #2884, aired 1997-02-27 | GENERAL SCIENCE $600: All amino acids contain carbon, hydrogen, oxygen & this element Nitrogen |
| #2878, aired 1997-02-19 | THE ELEMENTS $400: This element found in coal derives its name from the Latin word for "coal" carbon |
| #2867, aired 1997-02-04 | CHEMISTRY $400: The gas you exhale, it makes dry ice when solid Carbon Dioxide |
| #2863, aired 1997-01-29 | CHEMISTRY $300: It's the branch of chemistry that studies compounds containing carbon organic chemistry |
| #2827, aired 1996-12-10 | 19TH CENTURY SCIENCE $600: Edison's 1876 carbon transmitter was invented to improve this device Telephone |
| #2824, aired 1996-12-05 | MODERN HISTORY $200: In 1988 radio-carbon testing dated this holy cloth only to the Middle Ages Shroud of Turin |
| #2816, aired 1996-11-25 | GEMS & JEWELRY $100: The 1st of these crystalline carbon gems discovered in South Africa was found in 1867 Diamonds |
| #2805, aired 1996-11-08 | CHEMISTRY $100: A golden yellow when liquid, this element symbolized C is used as a bleach & in making plastics carbon (chlorine) |
| #2798, aired 1996-10-30 | GENERAL SCIENCE $300: Lampblack, an amorphous form of this element, is produced by burning liquid fuel with too little air carbon |
| #2753, aired 1996-07-17 | SCIENCE $800: Organic chemistry specializes in compounds that contain this element Carbon |
| #2703, aired 1996-05-08 | BY THE TEEN NUMBERS $400: Isotope of carbon used for dating 14 |
| #2701, aired 1996-05-06 | INVENTORS $200: The first important product from his Menlo Park, N.J. lab was the carbon telephone transmitter Thomas Edison |
| #2699, aired 1996-05-02 | THE EARTH $1000: Quartz is composed of these 2 most common elements in the Earth's crust silicon & oxygen |
| #2690, aired 1996-04-19 | SCIENCE $300: Ebonite, a hard, black material, is made by vulcanizing a mixture of about 2 parts this to 1 part sulfur rubber |
| #2662, aired 1996-03-12 | SCIENCE $800 (Daily Double): In 1961 an isotope of this element replaced oxygen as the standard for determining atomic weight carbon |
| #2643, aired 1996-02-14 | THE ELEMENTS $400: The atomic weight of carbon is 12.011; the atomic weight of this element is 1.008 hydrogen |
| #2632, aired 1996-01-30 | POTPOURRI $100: Cakes rise in an oven because baking powder or yeast in the batter produces this gas Carbon Dioxide |
| #2612, aired 1996-01-02 | CHEMISTRY $400: Number of carbon atoms in each molecule of carbon dioxide 1 |
| #2610, aired 1995-12-29 | SCIENCE & NATURE $500: This chemical element makes up the hardest substance known in nature carbon |
| #2584, aired 1995-11-23 | PHYSICS $200: This element has two crystalline allotropes: diamond & graphite carbon |
| #2550, aired 1995-10-06 | SCIENCE $400: Carbon monoxide causes death by displacing oxygen from this blood pigment hemoglobin |
| #2549, aired 1995-10-05 | NATURE $300: Like diamond, this soft black mineral is made of pure carbon, but with a different crystal structure graphite |
| #2533, aired 1995-09-13 | THE TELEPHONE $200: A simple one of these devices used in telephones is filled with carbon granules a microphone |
| #2509, aired 1995-06-29 | GEMSTONES $400: It's a crystalline allotropic form of carbon diamond |
| #2505, aired 1995-06-23 | BUSINESS & INDUSTRY $400: The origins of this Connecticut-based chemical company go back to National Carbon Co. in 1886 Union Carbide |
| #2480, aired 1995-05-19 | WEIGHTS & MEASURES $2,250 (Daily Double): The unit for atomic weight of elements is set at 1/12 the weight of this element's no. 12 isotope carbon |
| #2479, aired 1995-05-18 | THE ENVIRONMENT $400: The use of these devices in cars has cut down on carbon monoxide emissions in the U.S., Canada & Japan catalytic converters |
| #2471, aired 1995-05-08 | ROCKS & MINERALS $600: With its softness & greasy feel, this form of carbon may be confused with molybdenite graphite |
| #2467, aired 1995-05-02 | ARCHAEOLOGY $400: U.S. chemist Willard F. Libby developed this method of dating in the 1940s carbon-14 |
| #2352, aired 1994-11-22 | GEOLOGY $200: This precious stone is crystalline carbon Diamond |
| #2335, aired 1994-10-28 | LIGHT $300: In this process plants use sunlight to combine carbon dioxide & water to make food photosynthesis |
| #2322, aired 1994-10-11 | LIFE $500 (Daily Double): It's the most abundant inorganic compound in living matter water |
| #2318, aired 1994-10-05 | WINE $200: The process of fermentation releases this gas carbon dioxide |
| #2205, aired 1994-03-18 | SCIENCE $200: At -109 F°., solid carbon dioxide is more commonly called this dry ice |
| #2186, aired 1994-02-21 | CHEMISTRY $3,000 (Daily Double): 2 atoms of this element, atomic No. 6, can join to form single, double or triple bonds carbon |
| #2178, aired 1994-02-09 | COMPUTERS $100: The ink-jet is a non-impact type of this, so carbon copies are impossible a printer |
| #2177, aired 1994-02-08 | SCIENCE & NATURE $200: Most fish expel carbon dioxide through these the gills |
| #2152, aired 1994-01-04 | PLANTS $1000: The Calvin cycle in this process turns carbon dioxide into carbohydrates photosynthesis |
| #2130, aired 1993-12-03 | SCIENCE $100: In breathing it's the gas you expel to the atmosphere carbon dioxide |
| #2112, aired 1993-11-09 | SCIENCE $400: Increased levels of this gas in the atmosphere add to the greenhouse effect, warming the earth carbon dioxide |
| #2111, aired 1993-11-08 | THE ELEMENTS $400: Organic chemistry is devoted to this element that forms diamonds carbon |
| #2097, aired 1993-10-19 | INVENTORS $100: One of his first inventions at Menlo Park was the carbon transmitter Edison |
| #2081, aired 1993-09-27 | SCIENCE $300: Photosynthetic bacteria make their food from sunlight, hydrogen sulfide & this gas carbon dioxide |
| #2071, aired 1993-09-13 | THE ELEMENTS $500: Its atomic number, 6, is half its atomic weight, 12 carbon |
| #2069, aired 1993-09-09 | FAMOUS FIRSTS $500 (Daily Double): Invented c. 1800 by Ralph Wedgewood, this office supply was made obsolete in offices by the Xerox machine carbon paper |
| #2047, aired 1993-06-29 | TECHNOLOGY $200: In 1835 C.S.A. Thilorier froze this gas to create the first "dry ice" carbon dioxide |
| #2019, aired 1993-05-20 | ARCHAEOLOGY $600: Common dating techniques are carbon-14, counting tree rings & analyzing grains of this pollen |
| #2018, aired 1993-05-19 | LIFE SCIENCE $2,000 (Daily Double): Humans are life forms "based" on this element carbon |
| #1984, aired 1993-04-01 | GENERAL SCIENCE $100: Anthracite, the highest grade of coal, is composed almost entirely of this element carbon |
| #1974, aired 1993-03-18 | SCIENCE $200: This gas is a product of photosynthesis oxygen |
| #1972, aired 1993-03-16 | THE PLANETS $400: In 1976 the Viking I lander found that this planet had an atmosphere of 95% carbon dioxide Mars |
| #1964, aired 1993-03-04 | ROCKS & MINERALS $600: This soft black mineral, a form of carbon, is the primary raw material for synthetic diamonds graphite |
| #1962, aired 1993-03-02 | INKS & DYES $200: India ink contains a suspension of lampblack, which is this element carbon |
| #1959, aired 1993-02-25 | "A" "B" "C"s $400: It's probably the only element to have a whole branch of chemistry devoted to it: organic chemistry carbon |
| #1945, aired 1993-02-05 | THE ENVIRONMENT $200: Trees help humanity by absorbing this gas, but it's released to the atmosphere when they are burned carbon dioxide |
| #1922, aired 1993-01-05 | ARCHAEOLOGY $400: Charcoal is a particularly easy material for this type of dating carbon dating |
| #1919, aired 1992-12-31 | THE LETTER C $200: The CC at the bottom of a letter, even if it's a Xerox, stands for this carbon copy |
| #1895, aired 1992-11-27 | THE ENVIRONMENT $300: Burning 1 gallon of gasoline in your car can produce some 20 pounds of this "greenhouse gas" carbon dioxide |
| #1882, aired 1992-11-10 | INVENTIONS $500: In 1876 he introduced a carbon transmitter for Bell's telephone Thomas Edison |
| #1874, aired 1992-10-29 | GASES $600: Baking powder produces this gas carbon dioxide |
| #1869, aired 1992-10-22 | WINE $300: This gas provides the effervescence in sparkling wines carbon dioxide |
| #1834, aired 1992-07-16 | METALS $2,000 (Daily Double): Except for iron & steel, the world uses more of this metal than any other aluminum |
| #1796, aired 1992-05-25 | "HYDRO" SCIENCE $500: Methane, the main constituent of natural gas, is the simplest form of this compound hydrocarbon (carbon & hydrogen) |
| #1788, aired 1992-05-13 | THE ENVIRONMENT $200: It's predicted that global temperatures will rise 2º by 2025, mostly from accumulation of this gas carbon dioxide |
| #1784, aired 1992-05-07 | THE ELEMENTS $500: OVer 98% of the carbon on earth is this isotope carbon-12 |
| #1753, aired 1992-03-25 | WORD ORIGINS $300: It's from the Old English & originally meant a piece of carbon glowing without fire coal |
| #1739, aired 1992-03-05 | MISC. $800: It's an alloy of iron, carbon & over 4% chromium that's resistant to corrosion stainless steel |
| #1707, aired 1992-01-21 | CHEMISTRY $1000: 1 amu, or atomic mass unit is 1/12 of the mass of an atom of this element carbon |
| #1699, aired 1992-01-09 | SCIENCE $600: Cane sugar is a chemical compound consisting of carbon, hydrogen & this element oxygen |
| #1688, aired 1991-12-25 | AIR $600 (Daily Double): In the 17th century this compound became the first part of the air to be identified carbon dioxide |
| #1676, aired 1991-12-09 | PHYSICAL SCIENCE $100: This barbecue fuel, a form of carbon, is made by heating wood without air charcoal |
| #1667, aired 1991-11-26 | PHYSICAL SCIENCE $600: Willard Libby won a Nobel Prize for showing you can date fossils by the amount of this isotope in them carbon (carbon 14) |
| #1663, aired 1991-11-20 | SCIENCE $400: To make pencil lead, this form of carbon is mixed with clay graphite |
| #1662, aired 1991-11-19 | VOLCANOES $400: The 2 main gases emitted by volcanoes are steam & this, which explains the bubbles CO2 (carbon dioxide) |
| #1641, aired 1991-10-21 | IRON $1000: When the carbon content of iron is between .05% & 2%, it's no longer referred to as iron, but called this steel |
| #1633, aired 1991-10-09 | PHYSICS $600: Researchers have named a new form of carbon buckyballs from its resemblance to his
geodesic domes Buckminster Fuller |
| #1620, aired 1991-09-20 | SCIENCE & NATURE $300: Dry ice is made by cooling & compressing this gas carbon dioxide |
| #1618, aired 1991-09-18 | THE ELEMENTS $100: Sir Humphry Davy discovered boron & showed diamonds are a form of this carbon |
| #1584, aired 1991-06-20 | PHYSICAL SCIENCE $200: Burning methane, CH4, in oxygen, O2, produces water, H2O, & this, CO2 carbon dioxide |
| #1574, aired 1991-06-06 | "C" IN CHEMISTRY $100: When activated, this form of carbon is used to purify liquids charcoal |
| #1571, aired 1991-06-03 | PHYSICAL SCIENCE $600: The black charred surface on your toast this morning is this element carbon |
| #1560, aired 1991-05-17 | THE MOON $400: The most common compound on Earth, none of it has been found on the Moon water (H2O) |
| #1551, aired 1991-05-06 | SCIENCE $400: Bort, an impure type of this form of carbon, is used for cutting, not for jewelry diamond |
| #1536, aired 1991-04-15 | "I" IN SCIENCE $300: All non-carbon compounds are studied by this major branch of chemistry inorganic |
| #1524, aired 1991-03-28 | GEMS & JEWELRY $600: All diamonds consist of this element carbon |
| #1514, aired 1991-03-14 | "G" IN GEOLOGY $200: This form of carbon used in pencils is also called plumbago, or black lead graphite |
| #1480, aired 1991-01-25 | SCIENCE $200: It's the branch of chemistry that deals with carbon compounds Organic Chemistry |
| #1414, aired 1990-10-25 | PHYSICAL SCIENCE $600: Solid carbon dioxide dry ice |
| #1388, aired 1990-09-19 | BIOLOGY $200: This plant process removes an estimated 100 billion tons of carbon from the atmosphere each year photosynthesis |
| #1385, aired 1990-09-14 | PENCILS $400: Pencil lead isn't lead but a mixture of clay, water & this form of carbon graphite |
| #1384, aired 1990-09-13 | POTPOURRI $100: Cheaper grades of champagne are made to sparkle by adding this gas carbon dioxide |
| #1352, aired 1990-06-19 | ARCHAEOLOGY $400: First used in the 1950s, this method of dating is accurate for remains up to 8,000 years old carbon-14 dating |
| #1, aired 1990-06-16 | CHEMISTRY $800: Lampblack consists mostly of this element carbon |
| #1330, aired 1990-05-18 | THE UNIVERSE $400: Our atmosphere has 21% oxygen & a little of this gas; Venus has just a trace of oxygen & 95% this gas Carbon dioxide |
| #1328, aired 1990-05-16 | ECOLOGY $400: The Environmental Defense Fund has proposed new forests be planted to absorb this gas Carbon dioxide |
| #1320, aired 1990-05-04 | IRON $500: By definition, steel is an alloy of iron & this element Carbon |
| #1319, aired 1990-05-03 | WINE $300: During fermentation, this converts sugar in the grape juice into alcohol & carbon dioxide Yeast |
| #1316, aired 1990-04-30 | SCIENCE $200: In the process of photosynthesis, plants take in carbon dioxide & release this gas oxygen |
| #1273, aired 1990-02-28 | WASHINGTON STATE $400: Carbon, one of these on Mt. Ranier, is over 6 miles long a glacier |
| #1265, aired 1990-02-16 | CHEMISTRY $500: Allotrope of carbon that's used as a solid lubricant graphite |
| #1198, aired 1989-11-15 | PHYSICAL SCIENCE $300: Carbohydrates, such as sugars & starch, contain these 3 elements carbon, hydrogen, & oxygen |
| #1197, aired 1989-11-14 | NUCLEAR PHYSICS $200: This element, assigned atomic mass unit of 12.000, is the standard from which all others are measured carbon |
| #1160, aired 1989-09-22 | 20th CENTURY WRITERS $2,000 (Daily Double): A critic called her "A major existentialist, not merely... a carbon copy of Sartre" Simone de Beauvoir |
| #1131, aired 1989-07-03 | POTPOURRI $1000: Peas can improve soil by taking this gaseous element from the air binding it to their roots nitrogen |
| #1107, aired 1989-05-30 | WINE $200: It's this gas that makes crackling rosé crackle carbon dioxide (carbonic acid gas) |
| #1072, aired 1989-04-11 | PHYSICAL SCIENCE $1000: This form of carbon can be used as a lubricant or to write out an order to buy it graphite |
| #1065, aired 1989-03-31 | THE HEART $200: Blood entering the right side of the heart contains this gas; blood leaving the left side doesn't carbon dioxide |
| #1016, aired 1989-01-23 | POTENT POTABLES $400: Some cheaper grades of champagne sparkle because this gas has been added carbon dioxide |
| #999, aired 1988-12-29 | NONPOTENT POTABLES $200: CO2 in H2O carbonated water |
| #985, aired 1988-12-09 | ARCHAEOLOGY $600: This method of dating can tell the age of an artifact that is up to 40,000 years old carbon-14 dating |
| #979, aired 1988-12-01 | SCIENCE $1000: 98% of the world's rock consist mostly of oxygen & this element silicon |
| #971, aired 1988-11-21 | MARS $500: It's now believed they're made up of frozen carbon dioxide & water ice caps |
| #931, aired 1988-09-26 | CHEMISTRY $1000: A centuries-old test for this gas is to see if bubbles of it turn limewater milky carbon dioxide |
| #930, aired 1988-09-23 | THE SOLAR SYSTEM $400: Though at least 95% of the atmosphere of Venus is this gas, there are no plans yet for a Venus cola carbon dioxide |
| #926, aired 1988-09-19 | SCIENCE $600: Organic chemistry has been defined as the chemistry of this element & its compounds carbon |
| #926, aired 1988-09-19 | SCIENCE $1000: Nathaniel Hayward sold Chas. Goodyear his process for treating rubber with this element sulfur |
| #924, aired 1988-09-15 | PHYSICAL SCIENCE $400: When an alcohol burns, water & this common gas are formed carbon dioxide |
| #915, aired 1988-07-22 | WEATHER $500: It's estimated Earth's mean temperature may rise 4°C by the mid-21st cent. due to increase of this gas carbon dioxide |
| #880, aired 1988-06-03 | BIOLOGY $200: Fleischmann's says one ounce of this carbon dioxide-making substance contains about 280 billion cells yeast |
| #869, aired 1988-05-19 | ARCHAEOLOGY $400: Carbon dating puts the building of this landmark on the Salisbury Plain back to about 1988 B.C. Stonehenge |
| #861, aired 1988-05-09 | PLANET EARTH $200: The greenhouse effect that traps heat is produced by a layer of this gas in the atmosphere carbon dioxide |
| #846, aired 1988-04-18 | BOTANY $500: During the night when photosynthesis stops, green plants release this gas into the atmosphere carbon dioxide |
| #844, aired 1988-04-14 | ABBREVIATIONS $400: It's the element whose symbol is "Co" cobalt |
| #813, aired 1988-03-02 | CHEMISTRY $600: The isotope of this element with a mass number of 12 is the standard for atomic mass measurement carbon |
| #813, aired 1988-03-02 | CHEMISTRY $1000: While carbon atoms usually link in chains, in benzene they link in this shape rings |
| #804, aired 1988-02-18 | "D" IN SCIENCE $200: The natural crystalline allotropic form of carbon diamond |
| #803, aired 1988-02-17 | TECHNOLOGY $200: A soda-acid extinguisher is designed to produce this fire-fighting gas carbon dioxide |
| #791, aired 1988-02-01 | PREHISTORIC TIMES $600: In the late 1940s, Willard Libby developed this process for determining the age of a fossil carbon-dating |
| #790, aired 1988-01-29 | GEOLOGY $400: This hard coal has the highest carbon content of all coals anthracite |
| #765, aired 1987-12-25 | CHEMISTRY $200: Numerical isotope of carbon that's a useful tool in archaeological investigations carbon-14 |
| #761, aired 1987-12-21 | COOKING $800: Bread rises when yeast fermentation produces this gas carbon dioxide |
| #752, aired 1987-12-08 | PHYSICAL SCIENCE $200: After aluminum, it's the 2nd most abundant metal in the earth's crust iron |
| #751, aired 1987-12-07 | SCIENCE $600: This element comprises 40% of simple carbohydrates, like glucose carbon |
| #743, aired 1987-11-25 | MAN IN SPACE $800: A space module's life support system must remove this gas, a primary product of respiration carbon dioxide |
| #735, aired 1987-11-13 | AUTO SHOP $500: It changes exhaust hydrocarbons & carbon monoxide into carbon dioxide & water a catalytic converter |
| #690, aired 1987-09-11 | DRY $200: It's a trademark name for solid carbon dioxide Dry Ice |
| #676, aired 1987-07-13 | EVERYDAY SCIENCE $100: Element common to cigarette smoke, pencils & diamonds carbon |
| #635, aired 1987-05-15 | GEOLOGY $500 (Daily Double): Along with amorphous carbon, which includes coal, 1 of the other 2 forms of the element carbon diamond or graphite |
| #618, aired 1987-04-22 | PLANTS $500: The raw materials required for photosynthesis are water & this gas carbon dioxide |
| #578, aired 1987-02-25 | ANATOMY $400: Tiny lung sacs called alveoli are where carbon dioxide is exchanged for this oxygen |
| #576, aired 1987-02-23 | CHEMISTRY $1000: In the past, this common gas has been called "gas sylvestre" & "fixed air" carbon dioxide |
| #531, aired 1986-12-22 | BOTANY $800: Most of a plant's dry weight comes from this element, atomic #6 carbon |
| #530, aired 1986-12-19 | NATURAL RESOURCES $100: Coal is usually classified according to how much of this element it contains carbon |
| #505, aired 1986-11-14 | NUCLEAR PHYSICS $300: This protective material used to surround the fuel rod tubes at Chernobyl is also found in your pencil graphite |
| #488, aired 1986-10-22 | CHEMISTRY $800: Octane, C8H18, is an example of these organic compounds containing only hydrogen & carbon hydrocarbons |
| #448, aired 1986-05-28 | SCIENCE $200: He invented the zinc-carbon electric cell but not, most say, the burner that bears his name (Robert) Bunsen |
| #436, aired 1986-05-12 | CHEMISTRY $100: Chemical formula for carbon dioxide CO2 |
| #429, aired 1986-05-01 | CHEMISTRY $200: Member of carbon family so vital to electronics a high-tech "valley" bears its name silicon |
| #428, aired 1986-04-30 | PHYSICAL SCIENCE $4,000 (Daily Double): Constantly breaking down chemically, uranium changes to radium & ultimately to this mineral lead |
| #414, aired 1986-04-10 | WEATHER $300: Though a small part of the atmosphere, this gas has a big influence thru the "greenhouse effect" carbon dioxide |
| #407, aired 1986-04-01 | THE BODY IN QUESTION $200: The 2 main gases exchanged in the alveoli of the lungs oxygen & carbon dioxide |
| #370, aired 1986-02-07 | NATURE $1000: Colorful term that refers to the gradual heating of Earth's atmosphere by carbon dioxide in the air the Greenhouse Effect |
| #363, aired 1986-01-29 | PHYSICAL SCIENCE $400: The oxide of this common lightweight metal forms rubies & sapphires aluminum |
| #354, aired 1986-01-16 | SCIENCE $400: When falling, rain picks up extra oxygen, carbon dioxide, & this gas, the largest component of air nitrogen |
| #308, aired 1985-11-13 | SODA POP QUIZ $100: It's what gives soda pop the bubbles carbon dioxide |
| #293, aired 1985-10-23 | BOTANY $200: Green leaves turn carbon dioxide & water into sugar & this oxygen |
| #284, aired 1985-10-10 | SCIENCE $900 (Daily Double): As the word implies, every carbohydrate contains these 3 common elements carbon, hydrogen & oxygen |
| #283, aired 1985-10-09 | CHEMISTRY $800: The presence of this element makes organic chemistry organic carbon |
| #193, aired 1985-06-05 | ROCKS & MINERALS $1000: The most common element of the 8 that make up 98% of all the rocks in the world oxygen |
| #148, aired 1985-04-03 | SCIENCE $400: Its chemical symbol is C carbon |
| #126, aired 1985-03-04 | SCIENCE $200: Common gas represented by the formula CO2 Carbon dioxide |
| #124, aired 1985-02-28 | SCIENCE $600: C&H on sugar package could also stand for these 2 elements found in all organic compounds carbon & hydrogen |
| #57, aired 1984-11-27 | SPACE $400: It forms a large part of Jupiter's atmosphere or Earth's kitchen cleaners ammonia |
| #5, aired 1984-09-14 | CHEMISTRY $200: Coal & diamonds both consist of it carbon |
