Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
There are about 1,400 different species of bacteria in your belly button.
10
If you are cold you are more likely to be hungry because you use energy to keep warm.
144
Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
24
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
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
112