- Salt used to be a currency.
- A spider's silk is stronger than steel.
- The Eiffel Tower is over 300m (984 ft) tall.
- Wooly mammoths grew as tall as 14 feet, weighing 10 tons. Mammoths used tusks for protection and to attract mates.
- A fire will burn faster moving uphill than downhill.
- Employees of the Vatican pay no income tax.
- Half of all crimes are committed by people under the age of 18.
- Artificial Christmas trees have outsold real ones every year since 1991.
- A man once ate an entire airplaneu2014it took him 2 years.
- In zero gravity, a candle's flame may appear circular and blue.
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