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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.