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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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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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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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The horizontal fraction bar was introduced by the Arabs.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.