Beeman has demonstrated that people who score high on a standard measure of happiness solve about 25% more insight puzzles than people who are feeling angry or upset. (though research also suggests that being frustrated is an essential element of the problem solving process.) 32
Is America's heterogeneity our success? "people sharing knowledge across fields...encourages conceptual blending, which is an extremely important part of the insight process." 37
Jonathan Schooler, a psychologist specializing in the study of insight found "that people who consistently engage in daydreaming score significantly higher on measures of creativity." Daydreaming, however, must be accompanied with the awareness than you can interrupt a daydream and notice a creative thought.