What happens when you take 5 enourmous freshwater lakes isolated in the middle of a continent and suddenly open them up to the Atlantic? The ecology of the North American Great Lakes is changing fast. We spend the hour with Dan Egan, an award-winning writer and reporter at the Milwaukee Journal Sentinel and a senior water policy fellow at the University of Wisconsin-Milwaukee's School of Freshwater Sciences, to talk about his book "The Death and Life of the Great Lakes" and how invading species have caused havoc in the Lakes, from sea lampreys making their way up canals to zebra...