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
Cleopatra married two of her brothers.
47
If a surgeon in Ancient Egypt lost a patient while performing an operation, his hands were cut off.
67
Tablecloths were originally meant to serve as towels with which guests could wipe their hands and faces after dinner.
78
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
A female photographer in the 50s took tens of thousands of pictures and remained remained unknown until her death. She is now considered one of the most important street photographers ever.
20
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21