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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
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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 over 65,000 known species of protozoa. About 10,000 species are parasitic.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.