As two enormous, golden doors part, sunlight pours into an atrium filled with babies and puppies. Everyone is smiling. The air smells of freshly mown mint. Ripe avocados rain from the sky. (Somehow, they always miss the babies.) This is Harvard University’s new Center for Health and Happiness. At least, this is how I imagine it could grow to look. At a launch ceremony on Friday, the Harvard School of Public Health announced a $21