- Sun light can penetrate clean ocean water up to a depth of 73m (240 feet).
- There are 70 million sheep in New Zealand (with 4 million people).
- Mathematical developments increased rapidly around the time of the Italian Renaissance in the 16th century and continued through the scientific revolution of the 17th and 18th centuries, becoming increasingly abstract in the 19th and 20th centuries..
- Over 500 meteorites hit the Earth each year.
- The lie detector was invented in 1921.
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