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color: maroon;' href='http://www.pheedcontent.com/hostedMorselClick.php?hfmm=v3:a03456ccb14aa37f8f4b2298ca720b13:oZncCuCXdpv7uKf92Q%2BjfbcrppFpVjWihmRjKWHByjIAI%2FzLtwQGYQ%2FWqm8IFt0JW5MBhFoM4Kk7Xe0%3D'><img border='0' title='Add to Facebook' alt='Add to Facebook' src='http://images.pheedo.com/images/mm/facebook.gif'/></a> <a style='font-size: 10px; color: maroon;' href='http://www.pheedcontent.com/hostedMorselClick.php?hfmm=v3:febc1d34316cbf14fd74d3e5c537e27b:Pklw4JFinwKs201Bit4Ou%2Bs3ZgRQlts2LhWrFQoNP1n%2FNfGd85z0%2BmR23MQKPlX2LqpukcVj3PEvJA%3D%3D'><img border='0' title='Add to del.icio.us' alt='Add to del.icio.us' src='http://images.pheedo.com/images/mm/delicious.gif'/></a> <a style='font-size: 10px; color: maroon;' href='http://www.pheedcontent.com/hostedMorselClick.php?hfmm=v3:34214723b8f41e66126520ea4ca5d15e:BLWYAbIsXh5jJvw2B8iwCn8awXRQd1eByTJ%2Fq2EVLWWpzaUCwosyQniRrTcatMvmnRi0wa6Xxattng%3D%3D'><img border='0' title='Email this Article' alt='Email this Article' src='http://images.pheedo.com/images/mm/emailthis.png'/></a> <br clear="both" style="clear: both;"/> <a href="http://ads.pheedo.com/click.phdo?s=7ef26cdc9b603b8c54ed63f104a3c166&p=1"><img alt="" style="border: 0;" border="0" src="http://ads.pheedo.com/img.phdo?s=7ef26cdc9b603b8c54ed63f104a3c166&p=1"/></a> <img alt="" height="0" width="0" border="0" style="display:none" src="http://tags.bluekai.com/site/5148"/><img alt="" height="0" width="0" border="0" style="display:none" src="http://insight.adsrvr.org/track/evnt/?ct=0:5wz49e9&adv=wouzn4v&fmt=3"/> Tue, 15 Jan 2008 00:00:00 EST http://rss.sciam.com/click.phdo?i=dfcb1100589918670994b208743e308b http://www.scientificamerican.com/page.cfm?section=scidoku&amp;puzzle_id=69991372-E7F2-99DF-34974D181811F549 <a href=http://www.scientificamerican.com/page.cfm?section=scidoku&puzzle_id=69991372-E7F2-99DF-34974D181811F549>[More]</a><br clear="both" style="clear: both;"/> <br clear="both" style="clear: both;"/> <a style='font-size: 10px; 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