Dup. <a href="http://news.ycombinator.com/item?id=448676" rel="nofollow">http://news.ycombinator.com/item?id=448676</a><p>Washington.edu version of this dup: <a href="http://news.ycombinator.com/item?id=449041" rel="nofollow">http://news.ycombinator.com/item?id=449041</a>