Priyanka Chopra, the hot siren of Bollywood is a good teacher of mathematics indeed. Look at her geometrical accuracy as she falunts her perfect parabolic back which is tough for every model to achieve. Her mesmerizing looks and the sensible white covering on the body further increases the heart beat. Priyanka seems to be explaining the chapter of Parabolic curves and a deep look after the parabola will also give you the introductory chapter of Sphere shapes that is to follow. Well, learn some geometry guys...it will help you.