Mark Ruffalo to play twin brothers on a limited HBO drama series

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The movie star is returning to HBO, where he starred in the 2014 movie The Normal Heart, to play twin brothers in the eight-episode I Know This Much Is True, based on the bestselling book by Wally Lamb. The 1998 Oprah Book Club selection explores the American identity through the parallel lives of the twin brothers in the latter half of the 20th century.