- The Earth is struck by lightning over 100 times every second.
- Each time you see a full moon you always see the same side.
- You can tell the sex of a horse by its teeth (most males have 40, females 36).
- A rat can tread water for 3 days.
- The compass and straight edge were powerful tools in the advancement of geometry, allowing the construction of various lengths, angles and geometric shapes..
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