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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.