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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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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

Large regions of the Boreal forest in Alberta have been divided into a grid due to industrial develo Large regions of the Boreal forest in Alberta have been divided into a grid due to industrial develo
The Reticular Activating System and Related Regions in the Brain Are Important Areas of Focus for D The Reticular Activating System and Related Regions in the Brain Are Important Areas of Focus for D
Calligraphic scroll (detail), Syria or India. Calligraphic scroll (detail), Syria or India.
The growth of GHG emissions is greatest in the rapidly growing economies of India and China The growth of GHG emissions is greatest in the rapidly growing economies of India and China
Foods made with fat substitutes aren’t calorie free Foods made with fat substitutes aren’t calorie free
The USDA Organic Seal Foods Label The USDA Organic Seal Foods Label
Video: Neural regulation of blood pressure - baroreceptor and chemoreceptor reflexes

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