From Mehmet Elgin and Elliott Sober at History of the Philosophy of Science:
Abstract: Karl Popper argued in 1974 that evolutionary theory contains no testable laws and is therefore a metaphysical research program. Four years later, he said that he had changed his mind. Here we seek to understand Popper’s initial position and his subsequent retraction. We argue, contrary to Popper’s own assessment, that he did not change his mind at all about the substance of his original claim. We also explore how Popper’s views have ramifications for contemporary discussion of the nature of laws and the structure of evolutionary theory. – Popper’s Shifting Appraisal of Evolutionary Theory, Mehmet Elgin and Elliott Sober
HOPOS: The Journal of the International Society for the History of Philosophy of Science 2017 7:1, 31-55 More.
This fact about Popper has been kicking around for years. It keeps falling into popular science culture’s Darwinhole and somehow clambering out for air. Meanwhile, lesser thinkers than Popper are a-marchin’, marchin’
See also: But Darwinism is universally accepted among “real” scientists! Um…
Another scholar who dismissed Darwinism – at the end of his life
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Hat tip: Pos-Darwinista