Fossils are formed when remains are preserved in rock over millions of years.
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The Sumerians developed one of the earliest writing systems.
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The Peloponnesian War lasted nearly three decades.
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The Dead Sea is one of the saltiest bodies of water on Earth.
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Your brain uses 20% of your energy.
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The saber-toothed tiger is more accurately called Smilodon.
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A rhinoceros has thick skin for protection.
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