At the beginning of the twentieth century, Bertrand Russell best foreshadowed what was to come. In the final chapter of an often-read introductory book, The Problems of Philosophy (1912), Russell summarized the history of philosophy as a repeating series of failures to answer its questions. Can we prove that there is an external world? No. Can we prove that there is cause and effect? No. Can we validate the objectivity of our inductive generalizations? No. Can we find an objective basis for morality? Definitely not. Russell concluded that philosophy cannot answer its questions and so came to
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