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
No one knows how many people died during the sinking of the Titanic.
11
The Canadian province of New Brunswick (which was part of the UK at the time) had a bloodless war with the US state of Maine in 1839
36
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
India invented the Number System. Zero was invented by Aryabhatta.
59
The average life span of a peasant during the medieval ages was 25 years.
68
In 1897, Bayer, who is the maker of Aspirin, marketed the drug heroin.
56

