Show your appreciation for aesthetics and admiration for mathematical physics with this stylish and dignified shirt. There is a multitude of E equals m c squared shirts. But this bag is different. Not only is ia quality embroidery, it tells the full story of the mass energy relationship. Here we see how to account for the kinetic energy of a particle in motion. The total energy is the quadratic sum of the rest energy and the kinetic energy, Be proud, tell the full story. Customize this bag - change the colour of the fabric and the threads and educate your friends.