The Chicxulub impact crater in Mexico, formed 66 million years ago, is buried under sediment and sea.
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Ankylosaurus had a heavily armored body and a clubbed tail.
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The Earth is slightly flattened at the poles.
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Octopuses have three hearts and blue blood.
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The saber-toothed cat went extinct around 10,000 years ago.
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The human brain operates on about 20 watts of power.
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The human brain contains roughly 86 billion neurons.
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A rhinoceros has thick skin for protection.
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Fossils are formed when remains are preserved in rock over millions of years.
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