modern phenomenon), drug taking, political protest, and so on are important for many people. Nevertheless, he rejects the relativist interpretation of this situation – that in modernity, scientific knowledge is just one of many accounts of existence, all of which have equal validity. This is because, for Gellner, such alternatives to science are profoundly insignificant since they are technically impotent, as opposed to science. He sees that modern preoccupations with meaning and being as a self-indulgence that is only possible because scientific knowledge has enabled our world to advance so far. Unlike those in pre-modern times, whose overriding priority is to get hold of scientific knowledge in order to begin to develop, we can afford to sit back in the luxury of our well-appointed world and ponder upon such questions because we can take for granted the kind of world science has constructed for us. Michel Foucault Michel Foucault was a post-structuralist who saw human existence as being dependent on forms of knowledge – discourses – that work like languages. Languages/discourses define reality for us. In order to think at all, we are obliged to use these definitions. The knowledge we have about the world is provided for us by the languages and discourses we encounter in the times and places in which we live our lives. Thus, who we are, what we know to be true, and what we think are discursively constructed. Foucault defined history as the rise and fall of discourses. Social change is about changes in prevailing forms of knowledge. The job of the historian is to chart these changes and identify the reasons for them. Unlike rationalists, however, Foucault saw no element of progress in this process. To Foucault, what is distinctive about modernity is the emergence of discourses concerned with the control and regulation of the body. According to Foucault, the rise of body-centered discourses necessarily involved a process of secularization. Pre-modern discourses were dominated by religion, where things were defined as good and evil, and social life was centered around these concepts. With the emergence of modern urban societies, scientific discourses took over, and medical science was a crucial element of this new knowledge. Modern life became increasingly subject to medical control – the medical gaze, as Foucault called it. The rise to power of science, and of medicine in particular, coincided with a progressive reduction of the power of religious forms of