Mark Ruffalo says he knew Dark Waters would make a great film

Mark Ruffalo's new movie combines the actor's devotion to story-telling and activism. He plays Rob Bilott, a real corporate attorney who embarked on a two decade fight against Dupont to expose the harmful effects of chemicals. He ended up winning a payout of more than $600 million in a class action lawsuit. Ruffalo says he first learned of the story when reading an article about the case _ and knew it would make a great film. Dark Waters opens on Nov. 22