Is there a secret to happiness? Researcher Matt Killingsworth considers when humans are most happy. Journalist Carl Honoré speaks in praise of slowness. Can having less stuff, in less room, lead to more happiness? LifeEdited CEO Graham Hill makes the case for taking up less space. Psychologist Dan Gilbert discusses the surprising science of happiness. Benedictine monk David Steindl-Rast suggests that happiness is born from gratitude. Hosted by Guy Raz.