- The doorbell was invented in 1831.
- A pelican can hold more food in its beak than its belly.
- A hummingbird's heart beats at over a 1,000 times a minute.
- The first crossword puzzle appeared in 1913.
- Acrophobia is the fear of heights.
- The oldest known vegetable is the pea.
- Greyhounds can reach speeds of up to 67kph (42mph).
- A very small raindrop can travel up to 7 minutes from the sky before reaching you.
- Commercial airplanes maintain a cabin pressure of about 6,400 feet (just over 1 mile) above sea level.
- Hippopotamus milk is pink.
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