TED Talks need no introduction – and the site’s playlist of videos concentrating on ‘What Makes Us Happy?’ is a winner. Have you ever considered how many times a day you smile? And what about the effect of smiling on your wellbeing? 

Ron Gutman reviews a raft of studies about smiling, and reveals some surprising results. Did you know your smile can be a predictor of how long you’ll live — and that a simple smile has a measurable effect on your overall well-being? View on TED Talks.