Whether or not you have read the research, chances are you have experienced what psychologist, Mihaly Csikszentmihalyi calls ‘flow’. A professor at and former chairman of the Department of Psychology at the University of Chicago, Csikszentmihalyi (OK – I’ll help out – ma-hi-ya chick-sent-ma-hi-ya) explores the state of optimal experience – times of deep enjoyment. Remember those? You can also have them at work. If you don’t have time for the book (and why would that be?), listen to his story at ted.com.