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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

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Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

Lobes of the Brain Lobes of the Brain
Illustration of the Brain Lobes Showing Location of Broca’s Area and Wernicke’s Area Illustration of the Brain Lobes Showing Location of Broca’s Area and Wernicke’s Area
In a multiair engine design, the exhaust valves are opened by the exhaust camshaft lobes. Intake ... In a multiair engine design, the exhaust valves are opened by the exhaust camshaft lobes. Intake ...
The lobes of the cerebral hemishphere. The lobes of the cerebral hemishphere.
Two woodcuts from Darwin’s 1872 book, The Expression of Emotions in Man and Animals, that he used ... Two woodcuts from Darwin’s 1872 book, The Expression of Emotions in Man and Animals, that he used ...
Lobes of the Brain Lobes of the Brain
Video: Exercise and cardiac output

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