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JOY! PHOTOGRAPHS OF LIFE’S HAPPIEST MOMENTS by Bruce Velick with Robert Emmons (Chronicle £10.99) FEELING a bit down in the dumps this May? Sometimes all it takes is looking at a photograph to improve your mood, and this book of happy pictures — with everything from babies laughing to children jumping on the bed — is bursting with joy. A simple but effective idea, put together by Bruce Velick, a former gallery owner, and Robert Emmons, a professor of psychology, who together seem to know what it takes to cheer us up.