Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
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
Poor eyesight (myopia) is associated with higher IQ.
232
Mushrooms are more closely related to humans than they are to plants.
47
A person can live without food for about a month, but only about a week without water.
156
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Yawns are more contagious among people with closer relationships.
163