- Hippopotamuses have skin 3.8cm (1.5in) thick.
- 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.
- A group of frogs is called an army.
- You're more likely to be killed by a champagne cork than by a poisonous spider.
- You use 72 different muscles while speaking.
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