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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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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.