The adult human brain weighs about 3 pounds (1,300-1,400 g).
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In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
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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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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
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Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
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