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Thyroid conditions may make getting pregnant impossible.

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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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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.

The extent of acid rain in the United States has decreased. The extent of acid rain in the United States has decreased.
Diversity in the United States Diversity in the United States
German and Irish Settlement in the Northeastern United States, 1870 German and Irish Settlement in the Northeastern United States, 1870
One of the cultural privileges of being white in the United States is less suspicion of wrongdoing. One of the cultural privileges of being white in the United States is less suspicion of wrongdoing.
Importance of intermediate states Importance of intermediate states
Groundwater troubles in the United States Groundwater troubles in the United States
Video: Five phases of cardiac cycle & Atrial contraction

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