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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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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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Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.