i've studied nuclear war for 35 years -- you should be worried. | brian toon | tedxmilehigh Published 6 years ago • 8.8M plays • Length 14:59 Download video MP4 Download video MP3 Similar videos 51:42 how would the united states fight a nuclear war? 34:00 do we owe it all to asteroids? 21:48 why is our universe fine-tuned for life? | brian greene
