ARE YOU HUMAN? Imagine if your teaching assistant was actually a robot—and looked like Alicia Vikander. A picture of the “Ex Machina” lead actress graces a Wall Street Journal article that explores students’ surprise when they discovered one of their teaching assistants was, in fact, a bot. (It’s name, Jill Watson, might be a giveaway to the IBM Watson technology that powers it.) Her responses—which fooled even former IBM employees—were based on looking through nearly 40,000 questions and answers on a discussion forum.