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Vaccines prevent between 2.5 and 4 million deaths every year.

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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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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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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.

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The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

Influences on Temperature: Altitude and Elevation Influences on Temperature: Altitude and Elevation
Rising sea levels will affect millions in coastal zones and on islands Rising sea levels will affect millions in coastal zones and on islands
The annual pattern of rings changes with ocean temperature and coral health The annual pattern of rings changes with ocean temperature and coral health
Controls of Temperature Controls of Temperature
How long does exercise affect blood sugar? How long does exercise affect blood sugar?
A melting profile shows the increase in UV absorption versus temperature A melting profile shows the increase in UV absorption versus temperature
Video: Acid-base imbalances - metabolic acidosis and alkalosis

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