For previous discussions:<p><a href="http://news.ycombinator.com/item?id=4352290" rel="nofollow">http://news.ycombinator.com/item?id=4352290</a><p><a href="http://news.ycombinator.com/item?id=4350238" rel="nofollow">http://news.ycombinator.com/item?id=4350238</a>