The human brain has the capacity to store everything that you experience.
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Our eyes are always the same size from birth, but our nose and ears never stop growing.
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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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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
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The average person's skin weighs twice as much as their brain.
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Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
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