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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.