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( Susan Walsh )
Will cyber weapons leave us virtually naked?
Plus, PBS's 'Humanity from Space' predicts a world population of 9 billion by 2050.
J.J. Abrams broke his back filming 'Star Wars'
The 'Star Wars: Episode VII -- The Force Awakens' director reveals to Jon Stewart how the Millennium Falcon door that injured Harrison Ford on set also broke Abrams' back.