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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.