Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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The average person's skin weighs twice as much as their brain.
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A person can live without food for about a month, but only about a week without water.
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If you are cold you are more likely to be hungry because you use energy to keep warm.
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Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
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In Ancient Greece, small penises were desirable, and big ones were for ‘old men and barbarians’
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The human sigh acts as a physiological reset button.
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Your heart will pump about 212 million liters in its lifetime.
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