You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The average person's skin weighs twice as much as their brain.
131
Within three days of death, the enzymes that once digested your food begin to eat you.
22
A person can live without food for about a month, but only about a week without water.
156
The human brain doesn't stop developing until about 25 years old.
102
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