- 'orology' is the study of mountains.
- Tennis was originally played with bare hands.
- Greek philosopher and mathematician Pythagoras lived around the year 500 BC and is known for his Pythagorean theorem relating to the three sides of a right angle triangle: a^2 + b^2 = c^2.
- Cats can jump up to 7 times their tail length.
- Your head contains 22 bones.
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