Listen now (39 min) | Tensions between North Korea and the United States are at a fever pitch. The DPRK’s nukes are scary, but once the first missile flies there’s no way to know who might join the fight and how it might end. That’s scarier. So just how bad could it get? Would global nuclear war leave nothing alive but the cockroaches? We talked with Neil Halloran, who has literally done the math. The answer wasn’t what we expected.