Smile power can't fuel a car or substitute for currency, but we think it deserves just as much national attention as any other matter. Smiles are perfect for breaking the ice, avoiding a fight, and getting free stuff. Smiles show that we're happy and, in turn, they make people around us feel happy. That's right, they're contagious, but in a good way. So turn that frown, or that flat-mouthed indifferent look, upside down. Show off your smile power today.