Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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The brain receives 20% of the body’s oxygen and 25% of total body glucose utilization, despite it accounting for only 2% of a person’s weight (about 1.4 kilograms).
8
If you hold farts in during the day, they'll just come out when you sleep.
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There's 100 trillion good bacteria living in your body.
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There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
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In 1996, research found that having excessive body hair is linked to higher intelligence.
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