The adult human brain weighs about 3 pounds (1,300-1,400 g).
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It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
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When you take a step, you are using up to 200 muscles.
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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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The human body contains over a billion miles of DNA.
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It takes about 20 seconds for a red blood cell to circle the whole body.
102
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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