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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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The human body produces and destroys 15 million blood cells every second.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.