The human brain has the capacity to store everything that you experience.
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After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
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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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Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
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One human hair can support 3 ounces.
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Your thumb is about the same size as your nose.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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