The human eye can distinguish about 10 million different colors.
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The human brain continues to develop into early adulthood.
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Fossils form when organisms are preserved in sediment over millions of years.
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A rhinoceros has thick skin for protection.
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Octopuses have three hearts and blue blood.
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Smiling can influence mood through feedback to the brain.
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The wheel is one of the earliest human inventions.
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Cats have a reflective layer in their eyes that improves night vision.
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Certain sea slugs can incorporate stinging cells from their prey.
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