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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.