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The average adult has about 21 square feet of skin.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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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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Women are 50% to 75% more likely than men to experience an adverse drug reaction.

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The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Human eye anatomy Human eye anatomy
The fossil record of chimpanzees is sparse. The femur from Kikongo, Uganda (c) may represent a late The fossil record of chimpanzees is sparse. The femur from Kikongo, Uganda (c) may represent a late
A highly simplified view of the overall plan of the human body. A highly simplified view of the overall plan of the human body.
The human hypothalamus (in color) in relation to the optic chiasm and the pituitary gland. The human hypothalamus (in color) in relation to the optic chiasm and the pituitary gland.
The traditional human karyotypes derived from a normal female and a normal male The traditional human karyotypes derived from a normal female and a normal male
Overview of the components of the human digestive system, together with a brief description of their Overview of the components of the human digestive system, together with a brief description of their
Video: Phases of mitosis

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