OK ... so you have a sappy, supposedly inspirational quote. It's just an old wives' tale -- just a silly quip. It doesn't really mean anything. Right? Maybe ... maybe not. Doug Horton says, "Smile, it's free therapy." There just may be something to this! In psychology, there is a theory entitled the "facial feedback" hypothesis. This hypothesis states that "involuntary facial movements provide sufficient peripheral information to drive emotional experience" (Bernstein, et al., 2000). Davis and Palladino explain that "feedback from facial expression affects emotional expression and behavior" (2000). In simple terms, you may actually be able to improve your mood by simply smiling! A number of research projects support this hypothesis. One study, conducted by Levenson and Friesen, found that involuntary biological changes similar to those caused by emotions were experienced by participants who were instructed to make certain faces. T...