Ten apocalypses later, we're finally here.  It's easy to forget, living our comfortable lives, that there are hundreds of nuclear-armed missiles that could destroy civilisation at the drop of a hat... after just one order. Or maybe - an accident.  In this episode, I'll talk about the history of nuclear weapons; some of the incidents when we came closest to annihilation; and what the world would look like after a nuclear war. You can follow us on Twitter @physicspod, and visit the website at www.physicspodcast.com There, you can donate to the show, and contact us with your comments, questions, concerns, praise, abuse, ideas for future shows, and so on.