"Imagine you work hard to prepare a talk on a subject you care about. You get your message across, and when you finish the audience rises to its feet, its clapping sustained and sincere. One person might leave the room feeling, "I'm glad I got my message across, but I'm also happy it's over; now I can get back to the rest of my life." Another person, more sensitive to buzz, might walk away feeling, "What a trip! Did you hear that applause? Did you see the expression on their faces when I made that life-changing point? This is great!" But"