The human immune system destroys hundreds of potential cancer cells every single day.
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Hippopotamuses secrete a reddish fluid that helps protect their skin.
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A blue whale's heart can weigh over 400 pounds.
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The pacemaker regulates irregular heartbeats.
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The first artificial heart was implanted in the 1980s.
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Practice can strengthen neural pathways in the brain.
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The learned helplessness theory explains passivity after repeated failure.
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The human skeleton is made up of over 200 bones in adulthood.
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Camels have specialized red blood cells that help them survive dehydration.
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