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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.