One unbelievable fact. Three guesses. Archive →
Today's quiz →
2026-07-21
Which appeared first on Earth?
2026-07-20
The Moon is slowly moving away from Earth. About how much per year?
2026-07-19
In an average lifetime, how far does a person walk — roughly?
2026-07-18
Capybaras are famous for letting other animals sit on them. Why do they tolerate it?
2026-07-17
The U.S. has about 4% of the world's population. Roughly what share of the world's prisoners?
2026-07-16
Ounce for ounce, human bone is about as strong as which material?
2026-07-15
The Amazon rainforest is often said to produce 20% of Earth's oxygen. What's closer to the truth?
2026-07-14
About how many lightning bolts strike Earth every second?
2026-07-13
Roughly how many ants are alive on Earth at any given moment?
2026-07-12
Decades after the Chernobyl disaster, what happened to large mammal populations in the exclusion zone?
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