IBM’s Watson has graduated from competing on Jeopardy! to treating cancers. Memorial Sloan Kettering Cancer Center is using the AI system to analyze medical articles, patient records, and clinical-trial results—helping physicians make treatment decisions. In a recent study with Baylor College of Medicine, Watson sifted through 23 million scientific abstracts to identify, in weeks, six cancer-related proteins worth targeting. (Typically, researchers have one such find a year.) On deck: a $100 million project to develop health applications in Africa.