Since winning the Fields Medal (the closest thing in mathematics to the Nobel Prize) in 2010, Cédric Villani has become a roving ambassador for math and science. He's well-suited to the role: a patient explainer and broad-minded thinker, passionate about education and social engagement, with a seemingly limitless range of interests. We talked about Cédric's emergence as a math whiz, what it's like to spend years exploring a single equation, his fascination with statistical mechanics and entropy, whether math is "real" in some more-than-conceptual sense, what mathematicians do that computers can't, his love of comic books and his signature retro look.