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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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Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

Asthma. (a) A normal bronchiole. (b) An asthmatic bronchiole. During an asthma “attack,” the bronchi Asthma. (a) A normal bronchiole. (b) An asthmatic bronchiole. During an asthma “attack,” the bronchi
Great Serpent Mound, Adams County, Ohio, Hopewell culture. Great Serpent Mound, Adams County, Ohio, Hopewell culture.
Cuzco, Peru, Inca culture. Cuzco, Peru, Inca culture.
Religion often helps immigrants adapt to their new culture. What indications of this do you see in ... Religion often helps immigrants adapt to their new culture. What indications of this do you see in ...
Region’s Culture in International Context Region’s Culture in International Context
Region’s Culture in International Context Region’s Culture in International Context
Video: Digestion Animation

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