Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Green tea is able to stop the scent of garlic or onion from causing bad breath.
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Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.