Corneas are one of only two body parts that have no blood supply — they receive oxygen directly from the air.
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The human brain continues to develop into early adulthood.
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The eruption of Krakatoa in 1883 was heard thousands of miles away.
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Early humans hunted megafauna during the Ice Age.
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The first successful kidney transplant occurred in 1954.
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The human body contains trillions of microorganisms.
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The Earth's rotation speed varies slightly over time.
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Your brain creates reality.
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