| #11, aired 2023-05-16 | SCIENCE $800: The caustic compound potassium hydroxide has the 3-letter formula KOH & this 3-letter common name lye |
| #8589, aired 2022-03-03 | EARTH SCIENCE $400: Seen here, the formation known as an alluvial this 3-letter word is formed by the detritus deposited by a river a fan |
| #8456, aired 2021-08-02 | SCIENCE $1000: Also known as a thunderhead, this 12-letter type of cloud extends through all 3 levels of altitude classification cumulonimbus |
| #8292, aired 2020-12-01 | SCIENCE-PODGE $600: 3-letter name of the first drug approved by the FDA for the purpose of prolonging the lives of HIV & AIDS patients AZT |
| #7950, aired 2019-03-15 | 3-LETTER SCIENCE $200: This is the smallest unit of computer memory a bit |
| #7950, aired 2019-03-15 | 3-LETTER SCIENCE $400: Types of this include messenger, transfer & ribosomal RNA |
| #7950, aired 2019-03-15 | 3-LETTER SCIENCE $600: This type of atom is formed by the loss or gain of electrons an ion |
| #7950, aired 2019-03-15 | 3-LETTER SCIENCE $1000: This 3-letter nitrogen compound is used as an explosive in munitions & demolitions TNT |
| #7950, aired 2019-03-15 | 3-LETTER SCIENCE $1,100 (Daily Double): The Latin word for this element is stannum tin |
| #7363, aired 2016-09-21 | SCIENCE $600: Scientist Albert Hoffman, who died at age 102 in 2008, was best known for synthesizing this 3-letter hallucinogen LSD |
| #6253, aired 2011-11-23 | SCIENCE-Y 3-LETTER WORDS $400: It's short for the room or building where experiments are done a lab |
| #6253, aired 2011-11-23 | SCIENCE-Y 3-LETTER WORDS $800: It's the flowing back of the tide as the water returns to the sea ebb |
| #6253, aired 2011-11-23 | SCIENCE-Y 3-LETTER WORDS $1200: Sn is the chemical symbol for this tin |
| #6253, aired 2011-11-23 | SCIENCE-Y 3-LETTER WORDS $1600: This unit of illumination shares its name with an old brand of soap & detergent lux |
| #6253, aired 2011-11-23 | SCIENCE-Y 3-LETTER WORDS $2000: These 2 similarly spelled words mean a span of time longer than an era & an electrically charged atom an eon & an ion |
| #6023, aired 2010-11-17 | PLANT SCIENCE $1200: (Sarah of the Clue Crew presents the clue on a monitor.) Spruce needles are green all around, & in cross section you can see they're square; flatter needles with two light, lengthwise strips on the underside are from this 3-letter tree fir |
| #5857, aired 2010-02-16 | MEN OF SCIENCE $800: Albert Hoffman, who died aged 102 in 2008, was best known for synthesizing this 3-letter hallucinogen LSD |
| #4679, aired 2004-12-30 | MEN & WOMEN OF SCIENCE $200: In 1925 this American anthropologist first visited Samoa; she wrote a book about it 3 years later Margaret Mead |
| #3602, aired 2000-04-11 | SCIENCE OF 1990 $800: The Hubble Space Telescope was deployed by this space shuttle; 3 years later the Endeavour fixed its mirror Discovery |
| #3390, aired 1999-05-07 | THE SCIENCE OF COLOR $800: This 3-letter word for a basic color like blue is one element of the Munsell Classification System Hue |
| #3188, aired 1998-06-10 | THE "N" CROWD $200: When this PBS science series debuted on March 3, 1974 it was new; 24 years later, it's still "new" Nova |
| #3182, aired 1998-06-02 | 3-LETTER SCIENCE $100: You're "wiser" if you know it's a small pointed structure on a stem that grows into a flower or a leaf Bud |
| #3182, aired 1998-06-02 | 3-LETTER SCIENCE $200: About 4.5 billion years old, it's the closest G2 type star to where you're standing Sun |
| #3182, aired 1998-06-02 | 3-LETTER SCIENCE $300: You add this element to copper & zinc to get bronze Tin |
| #3182, aired 1998-06-02 | 3-LETTER SCIENCE $400: A neutral atom will become one of these when it gains or loses an electron Ion |
| #3182, aired 1998-06-02 | 3-LETTER SCIENCE $500: Ir"resistable" German physicist with a law about the flow of an electric current Ohm |
| #2928, aired 1997-04-30 | GENERAL SCIENCE $200: This 3-letter substance that carries the genetic code directs the production of RNA DNA |
| #2864, aired 1997-01-30 | GENERAL SCIENCE $100: The 16th letter of the Greek alphabet; in math it has the approximate value of 3.14 pi |
| #1551, aired 1991-05-06 | SCIENCE $200: This 3-letter prefix that precedes -bar, -metric & -tope means "equal" iso |
| #1472, aired 1991-01-15 | MEN OF SCIENCE $400: Paul Muller won a Nobel Prize for developing the insecticide known by this 3-letter name DDT |
| #278, aired 1985-10-02 | SCIENCE $1000: 3-letter suffix used to form chemical terms, esp. names of sugars & other carbohydrates -ose |
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