Science and technology

Associated Press
A YTN security person walks after the TV station's computer networks were paralyzed at its headquarter in Seoul, South Korea, Wednesday, March 20, 2013. Computers networks at two major South Korean banks and three top TV broadcasters went into shutdown mode en masse Wednesday, paralyzing bank machines across the country and prompting speculation of a cyberattack by North Korea. (AP Photo/Lee Jin-man)

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