Personalized Ohm Mighty Physics Teacher Youth Long Sleeve T-Shirt. Ohm Mighty text in a star burst and the text Physics Teacher is a humorous play on words to tickle the funny bone of your favorite teacher at back to school, graduation or holidays. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)