- The first toothbrush was invented in 1498.
- Elephants are capable of swimming 20 miles a day.
- Heavier, not bigger, lemons produce more juice.
- The average koala sleeps 22 hours each day.
- 10% of with world's food supply is consumed by insects.
- There is no butter in buttermilk.
- The Earth weighs 6,588,000,000,000,000,000 tons.
- Mount Everest is 8.9km (5.5 miles) high.
- One is the only number with letters in reverse alphabetical order.
- Penguins mate for life and both parents care for their young.
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