There are particles passing through your body constantly.
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Early humans hunted megafauna during the Ice Age.
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A rhinoceros has thick skin for protection.
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Ankylosaurus had a heavily armored body and a clubbed tail.
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Octopuses have three hearts and blue blood.
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Polar bears have a thick layer of fat to retain body heat.
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The human eye adapts to darkness by increasing light sensitivity.
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Fossils are formed when remains are preserved in rock over millions of years.
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Practice can strengthen neural pathways in the brain.
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