- The human eye can detect more shades of green that any other colour.
- A Chinese checkerboard has 121 holes.
- When 2 zebras stand side by side they usually face each other in opposite directions to keep an eye out for predators.
- The electric chair was invented by a dentist.
- In the 17th century Galileo Galilei and Johannes Kepler made important discoveries relating to planetary motion and orbits..
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