Let’s suppose, you are walking down the street where suddenly your name is called out by an old friend! You go ahead and spend some time with him and you both recall your childhood days. After that you both share your contact info and make a promise to meet again or once a month. Now, how did you two recognize each other? Any guesses? No! Well, at first your friend looked at your face and suddenly your name came into his head which made him call you immediately.