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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.