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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.