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The Vienna Circle was a group of early twentieth-century philosophers, mathematicians, logicians, and scientists, best known for developing the theory of scientific knowledge called logical positivism. Although positivism as a project has been largely abandoned, the group's ideas continue to have profound influence on contemporary philosophy of science. So what philosophical theories were proposed by the Vienna Circle? How might the socio-political circumstances of their time have shaped their radical ideas? And how did their ideas aim to shape politics? Josh and Ray ask David Edmonds from the University of Oxford, author of "The Murder of Professor Schlick: The Rise and Fall of the Vienna Circle."