A Japanese A.I. that was originally designed to identify croissant pastries from bear claws turned out to be capable of a whole lot more, including identifying cancer cells. Ok, so this is such a crazy story it seems fake, but this actually happened. The New Yorker articles that is refenced in the screenshot below is The Pastry A.I. That Learned to Fight Cancer if you want to read more about what happened. But it is summed up pretty well in the post by sindri42 below:

Source: sindri42