The human brain has the capacity to store everything that you experience.
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It takes about 20 seconds for a red blood cell to circle the whole 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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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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The human brain uses approximately as much energy as a 10 watt light bulb.
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The average sperm cell swims at 8 inches per hour.
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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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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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