5 rings bring images of sports and victories in the Olympic. 4 rings shift our minds towards cars and the company Audi. A tick mark takes us to shoes and the company Nike. The letter G now represents the all-important Gmail. Brands and logos are in front of us wherever we go. But why do companies change these, from time to time? Why does the company Pepsi keep changing the way its logo looks?Listen to two teenagers Mitansh Rajkotia and Anya Chaturvedi and Vibin from Headless Hippies shar...