Already posted as https://news.ycombinator.com/item?id=19462894 https://news.ycombinator.com/item?id=19462894 (EDIT: although this link is from the horse's mout

Already posted as https://news.ycombinator.com/item?id=19462894 https://news.ycombinator.com/item?id=19462894 (EDIT: although this link is from the horse's mouth rather than the WSJ)