One unbelievable fact. Three guesses. Archive →
Today's quiz →
2026-08-11
In NSF's household germ study, about what share of dish sponges and rags tested positive for coliform bacteria?
2026-08-10
In a University of Houston hotel-room study, which of these surfaces ranked among the most bacteria-contaminated?
2026-08-09
Roughly what share of the solar system's mass is locked up in the Sun?
2026-08-08
Between a cold winter day and a hot summer day, about how much taller can the Eiffel Tower get from thermal expansion?
2026-08-07
Do identical twins have the same fingerprints?
2026-08-06
Why is horseshoe crab blood so valuable to modern medicine?
2026-08-05
Pando in Utah looks like a forest of separate aspen trees. What is it actually?
2026-08-04
Which is hotter: Earth's inner core, or the visible surface of the Sun?
2026-08-03
What can the jellyfish Turritopsis dohrnii do that almost no other animal can?
2026-08-02
On Venus, which takes longer: one full rotation (a day), or one orbit of the Sun (a year)?
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