- 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..
- Mosquitoes dislike citronella because it irritates their feet.
- Cars were first started with ignition keys in 1949.
- Dry ice transforms directly from being a solid to a gas.
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