- Dolphins can hear underwater sounds from 24km (15miles) away.
- Humans are the only primates that don't have pigment in the palms of their hands.
- Water can boil and freeze at the same time.
- Armadillos can walk underwater.
- Penguins are only found in the southern hemisphere primarily in Antarctica (excluding zoos above the equator).
- When you look at a bright sky and see white dots, you are looking at your blood. Those are white blood cells.
- The Pacific Ocean is the world's largest.
- You have to eat 5kg (11lb) of potatoes to put on .5kg (1lb) of weight (a potato has no more calories than an apple).
- Much of the work done by Leibniz and Newton is based on theories by French philosopher Rene Descartes. As well as his many contributions to philosophy, Descartes also had a huge impact on mathematics, creating analytical geometry, developing a system that describes geometry using algebra, contributing to optics and much more.
- Before 1863 the postal service in the US was free.
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