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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.