Karl Raimund Popper, one of the 20th century's seminal philosophers, left the world a bold and original intellectual reflection on what has become known as the "demarcation problem" in distinguishing science from pseudoscience in general, and science from metaphysics in particular. He showed that the line between science and pseudoscience is neither as precise nor as impermeable as the regnant Logical Positivists claimed. They had contended that through empirical verifiability a distinction could be made between meaningful and meaningless discourse. Popper argued for falsifiability, not verifiability, as the proper criterion of the empirical and scientific character of a theory. In November, 1969, Popper and Edward Zerin met for two private interviews with the proviso that Zerin would not publish any of their conversations until after Popper's death. He died in 1994.
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