Feature Math Logic in the Blocks Simple puzzles can give computers an unexpectedly strenuous workout Share this:FacebookTwitterPocketRedditPrintEmail By Ivars Peterson August 9, 2002 at 1:33 pm This article is only available to Science News subscribers. Subscribers, enter your e-mail address to access our archives. Client key* E-mail* Log in Not a subscriber? Science News is a nonprofit. Support us by subscribing now. Subscribe