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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.