The largest cell in the human body is the female egg and the smallest is the male sperm.
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The average sperm cell swims at 8 inches per hour.
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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 doesn't stop developing until about 25 years old.
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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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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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