Each person has a unique tongue print, just like fingerprints.
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The human body glows faintly in complete darkness.
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Some animals can regenerate entire body parts.
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The saber-toothed tiger is more accurately called Smilodon.
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The Peloponnesian War lasted nearly three decades.
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A lion's roar can be heard from several miles away.
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Some animals sleep for years.
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The Earth's magnetic north pole moves over time.
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The Earth's mantle lies between the crust and core.
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