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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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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.

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Thyroid conditions may make getting pregnant impossible.

Traditional animal phylogeny based on body plans. Traditional animal phylogeny based on body plans.
Managing large bands of grazing animals requires detailed knowledge of local landscapes, especially Managing large bands of grazing animals requires detailed knowledge of local landscapes, especially
The relative influence of heredity and the environment in human behavior has fascinated and plagued ... The relative influence of heredity and the environment in human behavior has fascinated and plagued ...
From your experiences in grade school, can you tell if or how your teachers unintentionally helped ... From your experiences in grade school, can you tell if or how your teachers unintentionally helped ...
Environment of tRNAs at the ribosome as determined by cross-linking Environment of tRNAs at the ribosome as determined by cross-linking
A police record search of 250 incoming Grade 10 at a Secondary School shows that 26 had been ... A police record search of 250 incoming Grade 10 at a Secondary School shows that 26 had been ...
Video: Pores and Ion Channels

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