- 1 square inch of human skin contains 625 sweat glands.
- A group of kangaroos is called a mob.
- Pearls melt in vinegar.
- Cats can jump up to 7 times their tail length.
- Greek mathematics developed from around the 7th century BC, producing many important theories thanks to great mathematicians such as Pythagoras, Euclid and Archimedes.
- Ocean algae produces about 75 percent of the world's oxygen.
- The Statue of Liberty wears a size 879 sandal.
- Ostriches don't bury their heads in sand.
- The rarest type of diamond is green.
- The summer solstice marks the first day of summer and the longest day of the year.
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