Predicting Social Security Numbers

See also:<p><a href="http://news.ycombinator.com/item?id=690538" rel="nofollow">http://news.ycombinator.com/item?id=690538</a><p><a href="http://news.ycombinator.com/item?id=690636" rel="nofollow">http://news.ycombinator.com/item?id=690636</a>