- Mathematical developments increased rapidly around the time of the Italian Renaissance in the 16th century and continued through the scientific revolution of the 17th and 18th centuries, becoming increasingly abstract in the 19th and 20th centuries.
- Hippopotamuses have skin 3.8cm (1.5in) thick.
- The most common time for a wake up call is 7am.
- There are over 225,000 trees in New York's Central Park.
- All owls lay white eggs.
- The average person falls asleep in 7 minutes.
- The expression to 'knuckle down' originated from playing marbles (players used to put their knuckles to the ground for their best shots).
- There is 200 times more gold in the world's oceans than has been mined.
- A panda is not a bear and actually in the raccoon family. Koalas are marsupials.
- The longest time a person has been in a coma is 37 years.
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