This documentary, featuring Michio Kaku and numerous physicists and nuclear experts, examines the devastating what-if scenario, as well as the all-too-real history of public exposure to radiation - the silent, invisible and odorless killer - from x-ray exams, to Hiroshima, and to the recent accidents at Three Mile Island and Chernobyl. While ...

7 of the biggest existential risks possible are examined in this 82 minute special.