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Where Are They?
This article gives an overview of the results from years of Search For Extra-Terrestrial Intelligence (SETI) programs. Although aliens have yet to be found, the author says useful conclusions can still be drawn from the searches. This is a good nontechnical discussion of a popular subject. From the July 20, 2000, issue of "Scientific American".
http://www.scientificamerican.com/article.cfm?id=where-are-they
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