Loneliness is a greater risk factor for early death than obesity, and comparable to smoking 15 cigarettes a day.
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Camels have specialized red blood cells that help them survive dehydration.
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Ankylosaurs had armored bodies and clubbed tails.
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Tyrannosaurus rex had teeth that could grow over 12 inches long.
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Saber-toothed cats had elongated canine teeth.
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The vaccination syringe improved medical delivery methods.
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The human skin is the body's largest organ.
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The Earth's axis is tilted about 23.5 degrees.
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The human body contains trillions of cells.
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