‘Smile’ is a facial expression in which eyes brighten and the corners of the mouth comes slightly upwards while ‘ Frown’ is a facial expression indicating disapproval, displeasure or concentration characterized by a frowning of one’s brows. It is true that happiness will make us smile while anger and sadness will make us frown or cry. Just the act of smiling can briefly make us brighten our mood, whereas grimacing or frowning can make us irritable or upset or mad. “Conventional wisdom tells us that we can feel a little happier when we smile; on the other hand we can get ourselves in a more serious mood if we frown” Nicholas Coles Popular aphorisms such as “it takes 43 muscles to frown and only 17 muscles to smile” claiming a greater number of facial muscles are needed to produce a frown than to generate a smile. According to Discover Magazine there are 3 types of human smile : 1. ‘Reward Smile’ are displayed to reward the self or other people and to communi...