- The expression to 'knuckle down' originated from playing marbles (players used to put their knuckles to the ground for their best shots).
- Chimps can develop their own fashion trends.
- A Galapagos tortoise can take up to three weeks to digest a meal.
- Your brain uses 10 watts of energy to think and does not feel pain.
- A sharks top speed is 70kmh (44mph).
- Half of all crimes are committed by people under the age of 18.
- Women's hearts typically beat faster than men's hearts.
- The human eye can detect more shades of green that any other colour.
- Sea otters hold each other's paws while sleeping so they don't drift apart.
- Over a third of all pineapples come from Hawaii.
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