Bradley Cooper's fame skyrocketed after The Hangover, and in Limitless, he headlines a film solo for the first time. In the movie, Bradley plays a down-on-his-luck writer who gets a huge adjustment when he starts taking a drug that allows him to use 100 percent of his brain. On the set of the film, Bradley talked about playing a different kind of character, discussed the film's wonder drug, and explains why the role is his best one yet. Watch the interview, and be sure to check out five things B
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