Even if we take Nietzsche figuratively (which he would have much preferred anyway), fifty years of research on stress shows that stressors are generally bad for people,3 contributing to depression, anxiety disorders, and heart disease.

"The "omnivore's dilemma" (a term coined by Paul Rozin) is that omnivores must seek out and explore new potential foods while remaining wary of them until they are proven safe. Omnivores therefore go through life with two competing motives: neophilia (an attraction to new things) and neophobia (a fear of new things). People vary in terms of which motive is stronger, and this variation will come back to help us in later chapters: Liberals score higher on measures of neophilia (also known as "openness to experience"), not just for new foods but also for new people, music, and ideas. Conservatives are higher on neophobia; they prefer to stick with what's tried and true, and they care a lot more about guarding borders, boundaries, and traditions."

life is much like a movie we walk into well after its opening scene, and we will have to step out long before most of the story lines reach their conclusions. We are acutely aware that we need to know a great deal if we are to understand the few confusing minutes that we do watch. Of course, we don’t know exactly what it is that we don’t know, so we can’t frame the question well. We ask, “What is the meaning of life?