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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.
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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.