A smile can change the world because it is the most genuine expression of happiness and joy. A smile is contagious and can instantly make someone else feel happy. A smile can also make someone feel welcomed and accepted. A smile can be a powerful tool to change someone's mood and outlook on life. When you smile at someone, you are telling them that you care about them and that you are happy to see them. A smile has the ability to make someone's day, and even change their life. Thanks for sharing with us