- Paper money was first used in China.
- 'underground' is the only word that begins and ends with the letters 'und'.
- Horses have 18 more bones than humans.
- Hippopotamuses are born under water.
- 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.
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