Life expectancy in the US varies by up to 20 years between rich and poor zip codes — just miles apart.
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The Earth's magnetic poles slowly shift over time.
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The human body glows faintly in complete darkness.
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The Earth is slightly flattened at the poles.
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Some fish can survive in near-freezing water.
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The Earth's mantle is composed of semi-solid rock.
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The first successful heart transplant was performed in 1967.
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