Building a computer capable of winning a game show such as Jeopardy! takes much more than bestowing upon it the breadth of human knowledge. It has to be a fluent English speaker, too. David Ferrucci, lead researcher of the WATSON/Jeopardy! project, takes us through some of the challenges of creating a computer that can understand spatial directions and wordplay—things that a child can do with ease. You may even learn something about decorating.