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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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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.