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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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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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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.