- Rainbows can only be seen in the morning or late afternoon (the sun needs to be less than 40 above the horizon).
- Sharks have been on Earth for over 400 million years.
- The first parachute jump from plane was in 1918 over France.
- The expression to 'knuckle down' originated from playing marbles (players used to put their knuckles to the ground for their best shots).
- In 1900 the average life span in the US was 47.
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