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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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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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