- Tokyo was once known as Edo.
- 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.
- In 1872 Yellowstone in the US was the world's first national park.
- Humans share 50% of their DNA with bananas.
- Moths have no stomach.
- Red blood cells are produced in bone marrow.
- You cannot taste food until mixed with saliva.
- Early sunscreens included ingredients like rice bran oil, iron, clay, and tar.
- Blonde beards grow faster than darker beards.
- A blue whale can weigh as much as 30 elephants and as long as 3 large tour buses.
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