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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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Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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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 ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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