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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.