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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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On average, the stomach produces 2 L of hydrochloric acid per day.