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 human brain doesn't stop developing until about 25 years old.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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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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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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Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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