There is a great power in a simple smile - no matter where we come from, what language we speak, our cultural differences, our religion, etc. A smile is contagious, it represents affection, happiness and openness towards others. Most importantly it has the power to lift the moods of those you smile at. So, if you encounter someone looking sad, depressed, or down, smile at them, it is free! You never know how you can improve their day, and, it might improve yours as well.