How does Ant-Man shrink? Quantum Mechanics of course! Professor Spyridon Michalakis, scientific consultant of Marvel's most recent super hero block buster, starring Paul Rudd. It turns out the Hollywood star loves physics, so Spiro explains that while working directly with him, he came up with the Quantum Realm. Kevin and Spiro talk about some the tech details, how exotic atoms like muonium and pionium, can actually change size in real life labs.