The Olympic Games are held every four years.
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The human brain operates on about 20 watts of power.
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The human body contains trillions of cells.
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Rats can learn complex maze patterns quickly.
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The human heart beats over 100,000 times per day on average.
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Fingernails grow faster than toenails.
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The pacemaker regulates irregular heartbeats.
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The Earth's magnetic poles slowly shift over time.
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Some birds have hollow bones to reduce body weight for flight.
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