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In fact,however,there are many scientific theories which do not satisfy the falsification criterion.

Popper has claimed,for example,that Darwin's theory of natural selection is untestable,though most Darwinians feel that subsequent studies of the genetic structure of animal populations have provided one of its greatest predictive triumphs.

what matters in the end is that falsification usually leads to a theory's adjustment rather than to its dismissal;and this adjustment is a matter of social agreement between scientists who hold powerful professional positions and who control the purse strings of scientific funding.

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