The eruption of Krakatoa in 1883 was heard thousands of miles away.
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Some fish can survive in near-freezing water.
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Hippopotamuses secrete a reddish fluid that helps protect their skin.
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The human brain weighs about three pounds on average.
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Cats have a reflective layer in their eyes that improves night vision.
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The Earth completes one full rotation approximately every 24 hours.
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Fossils are formed when remains are preserved in rock over millions of years.
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The learned helplessness theory explains passivity after repeated failure.
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In 1920, a town in Minnesota briefly elected a bear as mayor in a publicity stunt.
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