- Human thigh bones are stronger than concrete.
- The yo-yo was originally used as a weapon for hunting the in the Philippines.
- The revolving door was invented in 1888.
- The average person sheds .7kg (1.5 pounds) of skin each year.
- 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..
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