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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.