Tears contain a natural painkiller, which reduces pain and improves your mood.
For every human on Earth, there are 1.6 million ants.
In the late 1600s, London was plagued by an attacker who would spank his victims with a rod and shout "Spanko!" before running away.
The first American woman to go to medical school was admitted as a joke. Geneva Medical School thought it was joke when Elizabeth Blackwell applied to attend 1847. She graduated in 1849, started her own practice, and opened an infirmary for the poor.