The eruption of Krakatoa in 1883 was heard thousands of miles away.
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The human brain operates on about 20 watts of power.
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The human eye adapts to darkness by increasing light sensitivity.
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A polar bear’s sense of smell is extremely powerful.
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A narwhal’s tusk is actually an elongated tooth.
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A giraffe's heart can weigh over 20 pounds.
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The human brain weighs about three pounds on average.
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The human brain operates on about 20 watts of power.
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The fennec fox has large ears that help dissipate heat.
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