The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
The human body contains over a billion miles of DNA.
147
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
12
The human brain doesn't stop developing until about 25 years old.
102
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
22