Early American humans hunted car-size armadillos and used their shells for houses.
12
The human brain is more active during sleep than during the day.
28
Your thumb is about the same size as your nose.
124
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
Every human spent about half an hour as a single cell.
144
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82