There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Our brains have a negativity bias and will remember bad memories more than good ones.
15
Early American humans hunted car-size armadillos and used their shells for houses.
12
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
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
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34