The adult human brain weighs about 3 pounds (1,300-1,400 g).
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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 takes about 20 seconds for a red blood cell to circle the whole body.
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Human hair and fingernails continue to grow after death.
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A man's beard grows fastest when he anticipates sex.
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We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
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The average sperm cell swims at 8 inches per hour.
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