"Don't worry, be happy." Sounds simple enough, yet many encounter setbacks in their pursuit of happiness. What if we could definitively say: "If you do this, you will achieve a happier and healthier life?" What if we could unlock the key to happiness? Enter Science.In an all new special edition from TIME, The Science of Happiness: New Discoveries for a More Joyful Life, editors investigate exclusive, cutting-edge research from the Lee Kum Sheung Center for Health and Happiness. Focusing in on the debate surrounding whether or not there is a direct relationship between happiness and health, this special edition explores the factors that affect happiness in three outlined sections--mind, life and spirit--and considers aspects such as positivity, optimism, purpose, family, finance, spirituality, and gratitude, in order to examine happiness from different angles. Although the research included in The Science of Happiness is a work in progress, it is a step toward unlocking the key to happiness by grounding a cute catchphrase in fact and science.