Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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You see your nose at all times, your brain just chooses to ignore it.
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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).
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For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
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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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All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
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