 In his first major published excursion from the philosophy of science, Feyerabend applied these ideas to the mind/body problem. In two papers published in 1963, he sought to defend materialism (roughly, the view that everything which exists is physical) against the supposition that the mind cannot be a physical thing. Although these papers exhibit a rather unclear mixture of views, they are now remembered primarily for having ushered in the position known as “eliminative materialism”, according to which our way of conceiving the mind and mental phenomena amounts to a seriously inadequate theory which is in conflict with a (materialistic) scientific account of those same things. Feyerabend suggested that the two theories in question were incommensurable, but that nevertheless we ought to prefer the materialistic one on general methodological grounds. This radical view of the mind/body problem has been one of Feyerabend’s most important legacies. Even though Feyerabend himself seems to have given it up in the late 1970s, it was taken up by Richard Rorty and, more recently, by Paul and Patricia Churchland.