Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
You can't tickle yourself.
29
The human body contains over a billion miles of DNA.
147
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
On average, there's 100 billion neurons in the human brain.
83