The adult human brain weighs about 3 pounds (1,300-1,400 g).
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You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
The human body contains over a billion miles of DNA.
147
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
32
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118