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What is good science? What goal - if any - is the proper end of scientific activity? Is there a legitimating authority that scientists mayclaim? How serious athreat are the anti-science movements? These questions have long been debated but, as Gerald Holton points out, every era must offer its own responses. This book examines these questions not in the abstract but shows their historic roots and the answers emerging from the scientific and political controversies of this century.