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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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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.