The average sperm cell swims at 8 inches per hour.
4
You can't tickle yourself.
29
The human body contains over a billion miles of DNA.
147
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
If your DNA was stretched out it would reach to the moon 6,000 times.
256
A man's beard grows fastest when he anticipates sex.
239
Our brains have a negativity bias and will remember bad memories more than good ones.
15
Your thumb is about the same size as your nose.
124