In some Malcolm Gladwell book that came out about ten years-ago he quoted a study that just holding a pencil between one's teeth upped happiness scores. A forced smile. I am reading his latest, Revenge of Tipping Point. Genuine smiles are in the eyes not the mouth. A local Safeway had a 'Smile Cop' who would give reprimand notice to employees who didn't smile enough, so they would be fired. Doing something nice for someone also hugely boosts happiness. Today I gave bikes to a mom and daughter with some stuff to decorate them for a big group ride. They are super happy and that makes me happy.