http://www.youtube.com/watch?v=fW6JFKgbAF4&NR=1&feature=endscreen
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Michio Kaku: The Dark Side of Technology.
http://www.youtube.com/watch?feature=fvwp&v=dTi4v3HveqE&NR=1
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Michio Kaku: Will Mankind Destroy Itself?
http://www.youtube.com/watch?feature=player_embedded&v=7NPC47qMJVg#at=14