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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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People about to have surgery must tell their health care providers about all supplements they take.