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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
Cyanide works by making the human body unable to use oxygen.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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.