The human brain has the capacity to store everything that you experience.
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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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If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
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When you take a step, you are using up to 200 muscles.
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The average person's skin weighs twice as much as their brain.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
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