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The human body produces and destroys 15 million blood cells every second.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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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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Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.