- Moisture (not air) causes super glue to dry.
- Fleas can accelerate 50 times faster than a space shuttle.
- The expression to 'knuckle down' originated from playing marbles (players used to put their knuckles to the ground for their best shots).
- You have over 600 muscles.
- The first train reached a top speed of only 8 kmh (5 mph).
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