In 1864, the first barbiturate (barbituric acid) was synthesized.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
