Happiness International Day of Happiness Comes to Pittsburgh By Jess Lasky • Mar 19, 2015 Via: Happyacts.org The weather is warming up, and maybe your demeanor is too. After a long harsh winter, this Friday brings the first day of spring and also the International Day of Happiness. Three years ago the United Nations declared March 20 a day of happiness. Marina Picciotto Offers a Scientific View on Happiness By The Chautauqua Institution • Mar 17, 2014 Marina Picciotto, Charles B.G. Murphy Chair in Psychiatry and professor of neurobiology and pharmacology at Yale University School of Medicine, speaks about the science of happiness Thursday morning in the Amphitheater.