The chapter on Sesame Street and Blue’s Clues looked at the question of Stickiness, suggesting that in order to be capable of sparking epidemics, ideas have to be memorable and move us to action. We’ve looked at the people who spread ideas, and we’ve looked at the characteristics of successful ideas. But the subject of this chapter—the Power of Context—is no less important than the first two. Epidemics are sensitive to the conditions and circumstances of the times and places in which they occur.