It takes about 20 seconds for a red blood cell to circle the whole body.
102
Tigers can see 6 times better at night than humans.
305
Mushrooms are more closely related to humans than they are to plants.
47
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
On average, there's 100 billion neurons in the human brain.
83
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
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69