- The yo-yo was originally used as a weapon for hunting the in the Philippines.
- Bats are the only mammals that fly.
- A person will die from total lack of sleep sooner than from starvation (Death can occur about 10 days without sleep while starvation takes a few weeks).
- The only continent with no active volcanoes is Australia.
- Babylonians measured the circumference of a circle as approximately 3 times the diameter, which is fairly close to today's measurement which uses the value of Pi (around 3.14)..
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