The Yellowstone supervolcano has erupted catastrophically three times — 2.1 million, 1.3 million, and 640,000 years ago.
Fact #6715
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Stress hormones prepare the body for a fight-or-flight response.
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The Ice Age ended about 11,700 years ago.
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The human heart beats over 100,000 times per day on average.
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Atmospheric rivers can deliver massive amounts of rainfall.
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Grizzly bears can run at speeds over 30 miles per hour.
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The fangtooth fish has some of the largest teeth relative to body size in the ocean.
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The Dead Sea is one of the saltiest bodies of water on Earth.
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The saber-toothed tiger is more accurately called Smilodon.
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