- The Chinese used fingerprints as a method of identification as far back as AD 700.
- Diamonds are the hardest natural substance.
- Oak trees don't produce acorns until they are 50 years old.
- Every minute about a billion tons of water falls on Earth.
- Over 500 meteorites hit the Earth each year.
- Bulletproof vests, fire escapes, windshield wipers, and laser printers were all all invented by women.
- Acorns are poisonous to humans (if eaten it can cause damage to your kidneys).
- Salt used to be a currency.
- No word in the English language rhymes with month.
- The oldest cockroach fossils are over 280 million years old.
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