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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.