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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.