Octopuses have three hearts — two pump blood to the gills, and one pumps it to the rest of the body.
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A sloth can take up to a month to digest a single meal.
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Practice can strengthen neural pathways in the brain.
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The human nose can distinguish thousands of different scents.
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The human body glows faintly in complete darkness.
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The Thirty Years’ War affected much of Central Europe.
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Ankylosaurs had armored bodies and clubbed tails.
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