The exact cause of death and burial site of Genghis Khan is unknown, because all of the 2000 funeral guests and 800 soldiers were killed in order to preserve the secret.
16
Leonardo Da Vinci made a robotic lion in 1515 that would walk, sway, open its mouth and move its tail - it even had a compartment that opened to present flowers.
22
There are 92 known cases of nuclear bombs lost at sea.
148
Queen Elizabeth II served as a mechanic and driver in World War 2.
36
No one knows how many people died during the sinking of the Titanic.
11
Cleopatra wasn't Egyptian; she was Greek.
107
During the Black Plague, it was thought that bad smells were the cause of the plague. "Plague Doctors" therefore wore masks with long beak-like noses stuffed with flowers or smoke to hide the smells.
19