Philipp Frank […] undermined common ideas of rationality in a different way by showing that the arguments against Copernicus had been perfectly sound and in agreement with experience while Galileo’s procedures were ‘unscientific’ when viewed from a modern standpoint. […] Frank’s work has been treated quite unfairly […]. Also his ideas are now commonplace. But it was he who announced them when almost everyone thought differently. (Feyerabend 1988: 277.)