- The expression to 'knuckle down' originated from playing marbles (players used to put their knuckles to the ground for their best shots).
- U.S. paper currency isn't made of paper u2013 it's actually a blend of cotton and linen.
- The doorbell was invented in 1831.
- The coloured part of your eye is called the iris.
- The teeth of a viperfish are so sharp and long that if it closed its mouth with the teeth inside, it would pierce its brain.
- Humans can encourage precipitation with cloud seeding.
- The average golf ball has 336 dimples.
- One acre of peanuts will make about 30,000 peanut butter sandwiches.
- The average person falls asleep in 7 minutes.
- The first paperback book was printed by Penguin Publishing in 1935.
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