- Greek mathematics developed from around the 7th century BC, producing many important theories thanks to great mathematicians such as Pythagoras, Euclid and Archimedes.
- The average elephant produces 22kg (50 pounds) of dunn each day.
- The first sailing boats were built in Egypt.
- In the 17th century Galileo Galilei and Johannes Kepler made important discoveries relating to planetary motion and orbits.
- The doorbell was invented in 1831.
- Rhinoceros have 3 toes on each foot.
- In 1900 the average life span in the US was 47.
- Dolphins can hear underwater sounds from 24km (15miles) away.
- Chameleons can move both their eyes in different directions at the same time.
- The first drug that was sold as a water soluble tablet was aspirin in 1900.
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