en-us Science news and technology updates from Scientific American http://www.scientificamerican.com Copyright 1996-2013 Scientific American http://www.scientificamerican.com 45 http://www.scientificamerican.com/media/logo/SAlogo_144px.gif 144 Thu, 27 Dec 2012 08:05:00 EST http://rss.sciam.com/click.phdo?i=5751c9270feda3123254baf8a330782c http://www.scientificamerican.com/article.cfm?id=a-history-of-limb-lengthening <p> </p> <a href=http://www.scientificamerican.com/article.cfm?id=a-history-of-limb-lengthening>[More]</a><br clear="both" style="clear: both;"/> <br clear="both" style="clear: both;"/> <a style='font-size: 10px; color: maroon;' href='http://www.pheedcontent.com/hostedMorselClick.php?hfmm=v3:3c992ad5a01787ea4a42919b28bc8235:rzbIWoM%2BvVGkWMKZzZmmno0ChP02rFl4UgdblVQAhRbUXJ5ZSkRfNp6DFOY9QN1zqeWaP5WelD3%2FQA%3D%3D'><img border='0' title='Add to digg' alt='Add to digg' src='http://images.pheedo.com/images/mm/digg.gif'/></a> <a style='font-size: 10px; color: maroon;' href='http://www.pheedcontent.com/hostedMorselClick.php?hfmm=v3:0baa5c48bd7f2ab3a2aeecb07a5b4f71:RlwH9yWV3O2CplEZh38EW1EFIY16A787IJG5XwfBFiRNCVwzCJrl02dZ%2BkxxBTnisxEkoBCJCEZzDhM%3D'><img border='0' title='Add to StumbleUpon' alt='Add to StumbleUpon' src='http://images.pheedo.com/images/mm/stumbleit.gif'/></a> <a style='font-size: 10px; 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Personalized recommendation engines help millions of people narrow the universe of potential films to fit their unique tastes. These services depend on a machine-learning strategy called singular value decomposition, which breaks down movies into long lists of attributes and matches these elementsto a viewer&#39;s preferences. 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