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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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The FDA recognizes 118 routes of administration.
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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).