A man's beard grows fastest when he anticipates sex.
239
It takes approximately 12 hours for food to entirely digest.
93
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
Your fingernails grow faster in summer.
744
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