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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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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.

Magnetosomes found in the spirillum Magnetospirillum magnetotacticum. Magnetosomes found in the spirillum Magnetospirillum magnetotacticum.
The yellow-winged darter, Sympetrum flaveolum, is a dragonfly found in Europe and mid and Northern C The yellow-winged darter, Sympetrum flaveolum, is a dragonfly found in Europe and mid and Northern C
The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha
Gender differences in activity preference are found across cultures, although the specific ... Gender differences in activity preference are found across cultures, although the specific ...
Types of supercoiling found in chromosomes Types of supercoiling found in chromosomes
Core-promoter elements found in focused promoters Core-promoter elements found in focused promoters
Video: Virtual Enzyme Kinetics & Lineweaver Burk Plot

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