- Half of all crimes are committed by people under the age of 18.
- Gorillas sleep 14 hours a day.
- The moon is 27% the size of the Earth.
- Elephants communicate in sound waves below the frequency that humans can hear.
- Swiss mathematician Leonhard Euler was probably the most influential mathematician of the 18th century, making discoveries in graph theory and introducing many modern mathematical words and notations among other things..
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