To gauge the influence that the Internet and digital media have had on American life over a single generation, Frontline starts at the Massachusetts Institute of Technology, where students confess that multitasking has shortened their attention spans. The filmmakers also probe the social effects of virtual environments like Second Life, and examine how the military is employing digital technology in everything from recruitment to combat with drones. Tuesday, Feb. 2, at 9 p.m., PBS; check local listings
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