- The expression to 'knuckle down' originated from playing marbles (players used to put their knuckles to the ground for their best shots).
- There are over 97,000 km (60,000 miles) of blood vessels in the average person.
- Most of the Vitamin C found in fruits is in the skin.
- Flushable toilets were in use in ancient Rome.
- Red light has the highest wavelength.
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