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Download it once and read it on your kindle device, pc,. Oster’s aim is not to provide answer. *free* shipping on qualifying offers. Download it once and read it on your kindle device, pc,. Web her new book, cribsheet: Web 27,589 ratings2,022 reviews. By emily oster (author) 4.6 5,591 ratings. From the author of expecting better, an economist's guide to the early years of parenting.