Scientists use the term "Eureka moment" to describe the point at which we have enough context to understand a new fact. At Tufts University they believe they can now tell exactly when a Eureka moment happens through measurements of the electrical activity in the brain. An intriquing result of the Tufts research is the notion that confusion is an essential part of remembering things. The activity of trying to make sense of information leads us to understanding and remembering the result. Alas, they can't tell us why these eureka moments happen (at least not yet...).