In this picture taken on Thursday, June 19, 2014, Laughter Yoga instructor Mahroo Sameni, right, leads a class in an outdoor session in the Darakeh mountainous area north of Tehran, Iran. The course in Tehran helps people from various age groups and social backgrounds to have fun and take a break from stressful daily lives. “It’s great when we practice laughter technics in natural resorts and reflect back our happiness to the universe,” Sameni says.(AP Photo/Vahid Salemi)