The adult human brain weighs about 3 pounds (1,300-1,400 g).
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Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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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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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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It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Your heart will pump about 212 million liters in its lifetime.
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