Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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In 1996, research found that having excessive body hair is linked to higher intelligence.
23
The average person's skin weighs twice as much as their brain.
131
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
12
The human sigh acts as a physiological reset button.
23
Your body is creating and killing about 2.4 million red blood cells per second.
17
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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