Mosquitoes are attracted to the carbon dioxide you exhale and to certain body odors — type O blood attracts them most.
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A polar bear once became an official member of a military unit in Norway.
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Grizzly bears can run at speeds over 30 miles per hour.
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The eruption of Krakatoa in 1883 was heard thousands of miles away.
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Fossils form when organisms are preserved in sediment over millions of years.
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The human skeleton is made up of over 200 bones in adulthood.
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The human brain contains roughly 86 billion neurons.
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The vaccination syringe improved medical delivery methods.
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