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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Excessive alcohol use costs the country approximately $235 billion every year.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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.