North Korea’s persistent efforts on nuclear weapons development and some loose talk about red buttons have raised new fears internationally about the possibilities of nuclear conflict. At home, government agencies also are addressing the questions about what to do in the case of a nuclear detonation. The Centers for Disease Control and Prevention (CDC), for example, will hold one of its Public Health Grand Round teaching sessions Jan. 16 on how medical professionals should respond–and although the event has been planned for months, it’s timing suddenly seems to be on the mark. […]