The adult human brain weighs about 3 pounds (1,300-1,400 g).
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One human hair can support 3 ounces.
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The human body contains over a billion miles of DNA.
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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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Enamel is hardest substance in the human body.
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The human brain has the capacity to store everything that you experience.
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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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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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