Farming, livestock, crops	Celestial bodies	Life sciences	Plant life	Chemicals, substances	Maps, people, and leisure
Food, nutrition, maintenance	Seasons, climate, weather	Vehicular travel & technology	Energy & matter	Inventions	Animals

Agriculture, General (S) - Farming, livestock, crops

• Are black-eyed peas really peas?
• How did the squash get its name?
• What is the difference between sweet potatoes and yams?
• Why does chopping an onion make you cry?
• How did the grapefruit get its name? It doesn’t look like a grape.
• Why does pepper make you sneeze?
• Why do turkeys have dark and white meat?

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Astronomy (QB) - Celestial bodies

• Why is it hot in the summer and cold in the winter?
• What are the northern lights?
• What does it mean when they say the universe is expanding?

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Biology (QH) & Human Anatomy (QM) - Life sciences

• Does your heart stop when you sneeze?
• What are stem cells?
• What causes a noise when you crack a joint?
• What is the strongest muscle in the human body?
• Why do fingers and toes wrinkle in the bathtub?
• Why does hair turn gray?

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Botany (QK) - Plant life

• What is the largest flower in the world?
• What is the smallest flower in the world?

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Chemistry (QD) - Chemicals & substances

• How does sunscreen work?
• Is it possible to fry an egg on the sidewalk if it's hot enough?

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Geography, Anthropology, Recreation (G) - Maps, people, & leisure

• What is a GPS? How does it work?
• What are the seven seas?

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Home Economics (TX) - Food, nutrition, maintenance

• What is "freezer burn?"
• Who invented the toothbrush and when was it invented?
• Who invented frozen food?
• Who invented the TV dinner?

Meteorology, Climatology (QC) - Seasons, climate, weather

• Can you tell the temperature by listening to the chirp of a cricket?
• Does water go down the drain counterclockwise in the northern hemisphere and clockwise in the southern hemisphere?
• Is it true that no two snow crystals are alike?
• Is the old adage “Red sky at night, sailor’s delight. Red sky in morning, sailor’s warning” true, or is it just an old wives’ tale?
• What causes the sound of thunder?
• Why is it hot in the summer and cold in the winter?

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Motor Vehicles, Aeronautics, Astronautics (TL) - Vehicular travel & technology

• Who invented the automobile?
• How does skywriting and skytyping work?

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Physics (QC) - Energy & matter

• Does water go down the drain counterclockwise in the northern hemisphere and clockwise in the southern hemisphere?
• How does a stone “skip” across water?
• How is the light of a lighthouse magnified so that it can be seen many miles out at sea?
• Is it possible to fry an egg on the sidewalk if it's hot enough?
• How does static electricity work?
• What are the northern lights?
• Why do boomerangs return when you throw them?
• Why does ultraviolet light cause color pigments to fade?
• Why don’t I fall out when a roller coaster goes upside down?
• Why is the ocean blue?

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Technology, General (T) - Inventions

• What is a GPS? How does it work?
• Who invented electric Christmas lights?
• Who invented frozen food?
• Who invented the toothbrush and when was it invented?
• Who invented the TV dinner?
• Who is credited with inventing the telephone?
• How does an hourglass measure time?
• How does skywriting and skytyping work?
• How is the light of a lighthouse magnified so that it can be seen many miles out at sea?

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Zoology (QL) - Animals

• How high can a nine-banded armadillo jump into the air?
• Why do bats live in caves?
• Which is the largest bear on Earth?
• Why and how do cats purr?
• How much water does a camel's hump hold?
• Can you tell the temperature by listening to the chirp of a cricket?
• How long is the life span of a flea?
• Why do geese fly in a "V"?
• Why do mosquitoes bite me and not my friend?
• Why do pigeons bob their heads when they walk?
• Is a polar bear’s fur transparent?
• Can zebras be domesticated?
• How can you tell the difference between a butterfly and a moth?

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