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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The average adult has about 21 square feet of skin.
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Cyanide works by making the human body unable to use oxygen.
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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.