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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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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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In 1864, the first barbiturate (barbituric acid) was synthesized.