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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.