Its something interesting that I have noticed in the smile of my son.This smile is a source of some energy.The same energy which makes my life as a parent wonderful.It provides me a purpose to live.This is precious.I dont have a unit to measure happiness.If anything that comes closer to the measure of happiness is this smile.The child tends to smile at things around him.There would be plenty of things in the world that seem amazing to the child.Searching out the joy is probably the man's natural state of existence.So I feel that there is nothing worthier than this smile.A simple smile of a child.