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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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There are 20 feet of blood vessels in each square inch of human skin.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.