Smiling is a simple way of promoting positivity, Why? because every time you smile (genuinely smile) there is always a person that you can make to smile as well. As you wake up, greeting your family with a good morning with a smile can make there day. Smiling can lessen(if not fully eliminate) negativity that surround their mind. One good example of this is when a child is going to perform in front of many people, he/she can ease if they would see their family/parent smiles which symbolizes that every thing will be okey.