- Your brain uses 25% of all the oxygen your breathe.
- Room temperature is defined as between 20 to 25C (68 to 77F).
- The expression to 'knuckle down' originated from playing marbles (players used to put their knuckles to the ground for their best shots).
- The revolving door was invented in 1888.
- A crocodile can't stick out its tongue.
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