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This is a SUPERB book! Building on Darwin's famous last sentence ("endless forms most beautiful") in the Origin of Species, Carroll gives a wonderful history and account of the science of Evolutionary Developmental Biology (Evo Devo). The story encompasses two broad categories: embryology - how animals develop their forms from embryo to adult, and evolution - how species have developed over the eons through natural selection. Evo devo exploded in the last decade as geneticists have begun to unlock the secrets of how our forms came to be. Why is it that birds got their feathers from dinosaurs which needed them to stay warm? Did you know that butterfly wings and centipede legs developed from fish gills? Neither did I. This is a fascinating book that will take you through the story of life, specifically the genetics of the development of species' physical forms. This is one of the best books I've ever read, but then again, it's not for everyone. But, if you love genetics.......