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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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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.