Scientific American - Observations - May 29, 2010
By Martin Gardner
Editor's note: In light of the recent death of Martin Gardner, we are republishing this article from the August 1998 issue of Scientific American. Gardner wrote the "Mathematical Games" column for Scientific American from 1956 to 1981 and continued to contribute columns on an occasional basis for several years afterward. This article, which includes four puzzles by Martin Gardner, was his final piece for the magazine.
http://www.scientificamerican.com/blog/post.cfm?id=a-quarter-century-of-recreational-m-2010-05-26&print=true">A quarter-century of recreational mathematics
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