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The origins of baseball are controversial. James A. Vlasich discusses the debates between two men intimately involved in nineteenth-century baseball, Henry Chadwick and Albert G. Spalding. Abner Graves of the Mills Commission claimed that Abner Doubleday had invented the game and he had done it in Cooperstown, New York. This claim was scrutinized at the time but the myth became etched into baseball history.
    Through the years, however, some critics have questioned the Mills Commission report. The problem is that the Baseball Hall of Fame is built on this shaky foundation. The lack of diligence on the part of Spalding’s self-appointed committee has led to a credibility gap for the baseball shrine that continues a half century after its dedication. Indeed, the story of the building of the Baseball Hall of Fame is filled with intrigue worthy of a political thriller.

Our understanding of vertebrate origins and the backbone of human history evolves with each new fossil find and DNA map. Many species have now had their genomes sequenced, and molecular techniques allow genetic inspection of even non-model organisms. But as longtime Nature editor Henry Gee argues in Across the Bridge, despite these giant strides and our deepening understanding of how vertebrates fit into the tree of life, the morphological chasm between vertebrates and invertebrates remains vast and enigmatic.

As Gee shows, even as scientific advances have falsified a variety of theories linking these groups, the extant relatives of vertebrates are too few for effective genetic analysis. Moreover, the more we learn about the species that do remain—from sea-squirts to starfish—the clearer it becomes that they are too far evolved along their own courses to be of much use in reconstructing what the latest invertebrate ancestors of vertebrates looked like. Fossils present yet further problems of interpretation. Tracing both the fast-changing science that has helped illuminate the intricacies of vertebrate evolution as well as the limits of that science, Across the Bridge helps us to see how far the field has come in crossing the invertebrate-to-vertebrate divide—and how far we still have to go.