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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Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
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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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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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It takes about 20 seconds for a red blood cell to circle the whole body.
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Your body is creating and killing about 2.4 million red blood cells per second.
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An Indian man known as "Snake Manu" can put small snakes, including deadly cobras, into his mouth and pass them out through his nose.
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