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Children play inside a replica of a blue whale's heart during the press preview of "Whales: Giants of the Deep" at the American Museum of Natural History, Wednesday, March 20, 2013 in New York. The exhibit transports visitors to the underwater world of the mightiest animals on earth and explores the latest research about these marine mammals as well as the central role they have played for thousands of years in human cultures. It opens March 23, 2013 and runs through January 5, 2014. (AP Photo/Mary Altaffer)
