 Popper showed that higher-level laws, far from reducible to, often conflict with laws supposedly more fundamental.Popper's prime example, already made by the French classical physicist and philosopher of science Pierre Duhem decades earlier, was Kepler's laws of planetary motion, long famed to be, and yet not actually, reducible to Newton's law of universal gravitation.For Feyerabend, the sham of inductivism was pivotal.