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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.