Your fingernails grow faster in summer.
744
A man's beard grows fastest when he anticipates sex.
239
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The human body contains over a billion miles of DNA.
147
There are about 255 babies born worldwide every minute.
46
Mushrooms are more closely related to humans than they are to plants.
47
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13