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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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 longest a person has survived after a heart transplant is 24 years.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Blood is approximately twice as thick as water because of the cells and other components found in it.