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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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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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Cyanide works by making the human body unable to use oxygen.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.