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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.