Christopher Emdin, an Associate Professor at Teachers College, Columbia University, loves to rap. And he loves using rap to teach kids all about science. That's why he helped put together B.A.T.T.L.E.S., a New York City-wide competition that challenges students to put scientific concepts into lyrical raps. The kids were up to the task and rapped about everything from "rock science, natural selection and genetics to how materials freeze or melt." And the winner -- Jabari Johnson, a senior from Urban Assembly School for the Performing Arts in Harlem -- was named on June 21, after the final competition took place on the Columbia University campus. Johnson will now have a chance to make a professional recording of his song about Kinetic Energy and post it on the Rap Genius website.