In 1996, research found that having excessive body hair is linked to higher intelligence.
23
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The brain receives 20% of the body’s oxygen and 25% of total body glucose utilization, despite it accounting for only 2% of a person’s weight (about 1.4 kilograms).
8
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
199
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
There's 100 trillion good bacteria living in your body.
17