`Limitless' wins weekend with $18.9M debut

LOS ANGELES: "Limitless," starring Bradley Cooper as an author who taps his full brain potential after sampling a revolutionary new drug, topped North America's weekend box office, data showed Monday.The darkly comic thriller film benefited from a charismatic lead actor in Cooper, of 2009 smash hit "The Hangover," to make $18.9 million in its debut weekend, according to industry tracker Exhibitor