The enamel on your teeth is the hardest substance your body produces.
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The heart can sometimes restart after stopping.
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An African elephant's ears help regulate its body temperature.
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The left lung is slightly smaller than the right to make room for the heart.
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About 1 in 20 people have double-jointed fingers.
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The use of defibrillators can restore normal heart rhythm.
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Your skin completely replaces itself about every 27 days.
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Your body produces about 300 billion new cells every day.
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