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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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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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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.