Leonardo da Vinci made the first draft for the contact lenses. They should have been made of thin glass filled with water...
Electric eels can regenerate their muscles and fins.
In the Middle Ages, patients were tended by nuns, who in between themselves called one another sisters. That name was later used for trained nurses.
The average weight of a male brain is 1450 grams, while the weight of an average female brain is about 1300 grams.
In the middle ages, nutmeg was the most expensive spice. Not because of the taste and smell, but because of the belief that it protected against the plague.
The real name of American film actor Michael Keaton (born 1951) is actually Michael Douglas, but due to the fact that an actor wanted to avoid the name of the older, more famous actor Michael Douglas (born 1944), surname Keaton was chosen in honor of the film actress Diane Keaton.
