August 2011 - Vol. 54 No. 8

August 2011 issue cover image

Features

News

In the Virtual Extension

To ensure the timely publication of articles, Communications created the Virtual Extension (VE) to bring readers high-quality articles in an online-only format. The following articles are now available to ACM members via the Digital Library.
Opinion Last byte

Puzzled: Uncommon Divisors

Welcome to three new puzzles. Solutions to the first two will be published next month; the third is (as yet) unsolved. In fact, this time it's a famously unsolved problem.

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