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Their pages are filled with complicated patterns and outlines of images, and colouring books for adults now top the Amazon best-seller list. But what's the appeal? Newsday spoke to Dr. Stan Rodski, phsychologist and neuroscientist and the author of his own anti-stress colouring books. (Photo: Newsday presenters Nkem Ifejika and Clare McDonnell holding their colouring book. Credit: Â鶹Éç)