There are more atoms in a grain of sand than there are grains of sand on all of Earth's beaches.
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Practice can strengthen neural pathways in the brain.
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The Tyrannosaurus rex may have had excellent vision.
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The human eye has a natural blind spot.
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Grizzly bears can run at speeds over 30 miles per hour.
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A blue whale's heart can weigh over 400 pounds.
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Certain fish can inflate their bodies to appear larger.
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Some fish can survive in near-freezing water.
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Certain sea slugs can incorporate stinging cells from their prey.
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