The average human brain has about 86 billion neurons.
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Water covers more than 70% of Earth's surface.
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The human skeleton is made up of over 200 bones in adulthood.
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There are more possible shuffles of a deck of cards than seconds since Earth formed.
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The Moon was formed billions of years ago.
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The invention of dialysis allows patients with kidney failure to survive.
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The pacemaker regulates irregular heartbeats.
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Fingernails grow faster than toenails.
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Early humans hunted megafauna during the Ice Age.
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