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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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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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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.