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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Cyanide works by making the human body unable to use oxygen.
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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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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.