The total length of all blood vessels in the human body is about 60,000 miles.
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Water is the only natural substance that commonly exists as a solid, liquid, and gas on Earth.
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Learning involves changes in neural connections.
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The pacemaker regulates irregular heartbeats.
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A narwhal’s tusk is actually an elongated tooth.
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The human brain can process visual information in as little as 13 milliseconds.
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The Earth's rotation causes day and night cycles.
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Early humans hunted megafauna during the Ice Age.
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The Earth's mantle is composed of semi-solid rock.
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