No one knows where it originated, but June 15 has become the unofficial National Smile Power Day. Negativity is soul-sucking, but the simple act of smiling has the ability to turn that around. It can convey encouragement and happiness without having to say a word. Smiling (even when you’re not happy) can help lift your mood and it helps everyone around you feel better. Research has proven that smiling really does increase attractiveness and likability between humans as well as creating a greater trust and increased interpersonal cooperation. Smiling at someone can help them to relax and...