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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Illicit drug use costs the United States approximately $181 billion every year.