- Bats are the only mammals that fly.
- Diamonds mined in Brazil are much harder than those found in Africa.
- 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.
- Employees of the Vatican pay no income tax.
- The first US coast to coast aeroplane flight occurred in 1911 and took 49 days.
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