The naked mole rat is the only cold-blooded mammal — it cannot regulate its own body temperature.
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DNA carries genetic information in living organisms.
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The first successful human heart transplant was performed in 1967.
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In 1809, two countries declared war and then forgot to sign a peace treaty for years.
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The learned helplessness theory explains passivity after repeated failure.
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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 invention of dialysis allows patients with kidney failure to survive.
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A narwhal’s tusk is actually an elongated tooth.
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A hyena’s jaw is powerful enough to crush bone.
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