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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Everyone has one nostril that is larger than the other.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.