Before one can talk clearly about moral relativism, one must first address relativism at a more general level, a level that includes statements that have nothing to do with practical or moral matters. Suppose you are talking to a man about whether the sun is a gaseous star possessing a gravitational pull on the earth that keeps our planet in orbit around it. He denies that this is true. You cannot tell whether he is sincere or just being silly, and you don't know how to argue scientifically about matters that we tend take for granted as true. You simply object, therefore, that science seems to show that he is wrong in his denial. He replies, "That is true for you, but not for me." You may not at this moment have the resources to be able to present a cogent (convincing) argument about the sun and gravity, but you can point out that his last comment is incoherent. By "incoherent" I mean that, regardless of what one thinks of astronomy, that last sentence s