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Cyanide works by making the human body unable to use oxygen.
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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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There are approximately 3 million unintended pregnancies in the United States each year.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.