Machine learning the hard way: Watson's fatal misdiagnosis

Opinion It started in Jeopardy and ended in loss. IBM's flagship AI Watson Health has been sold to venture capitalists for an undisclosed sum thought to be around a billion dollars, or a quarter of what the division cost IBM in acquisitions alone since it was spun off in 2015. Not the first nor the last massively expensive tech biz cock-up, but isn't AI supposed to be the future? Isn't IBM supposed to be good at this? It all started so well.