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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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The human body produces and destroys 15 million blood cells every second.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.