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
Mushrooms are more closely related to humans than they are to plants.
47
Human hair and fingernails continue to grow after death.
7
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
The human body contains over a billion miles of DNA.
147
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198