There is no better way to convince co-workers that you are happy than to smile as much as possible. Not only does smiling have clear social benefits; it can also lead to greater productivity, as the employee with a ready grin will often be assigned extra tasks from management. Most importantly, smiling is just good form- co-workers do not want to be burdoned with your problems and to do so would be inconsiderate. The Chinese philosopher Mencius once noted that "We are all here to have fun!" Smiling is the engine that drives fun, and fun is the engine that drives productivity.