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At 4:30, when most of Wall Street is winding down, Walter Zimmermann begins a high-stakes, high-wire act conducted live before a paying audience. About 200 institutional investors—including airlines and oil companies—shell out up to $3,000 a month to catch his daily webcast on the volatile energy markets, a performance that can move hundreds of millions of dollars.

Research shows that alcohol adversely affects the brain. When health professionals encounter patients who are having cognitive difficulties, such as impaired memory or reasoning ability, alcohol use may be the cause of the problem. When treating patients who have abused alcohol, it may be of value to attempt to identify the level of any impairment and to modify the treatment accordingly.