Mihaly Csikszentmihalyi asks, "What makes a life worth living?" Noting that money cannot make us happy, he looks to those who find pleasure and lasting satisfaction in activities that bring about a state of "flow."

What comes to mind when you think about the most fun moments of your life? Science journalist Catherine Price asked thousands of people across the world this question, and their answers led her to a new definition of "true" fun: a special confluence of playfulness, connection and flow. Hear her thoughts on why having fun is good for your mental ...