Much research addresses how and why many of the earth's thousands of languages are disappearing. The question still arises, however, as to why it should matter to the rest of us if, say, Pite Sami, a language spoken by fewer than 20 inhabitants of Norway and Sweden, should vanish from the face of the Earth. Jeff Good, Ph.D., a University at Buffalo linguist, says that we should attend to these losses because even seldom-used languages can tell us a great deal about the methods of categorization of the natural and mental world and because they can serve as vital links between the present and the prehistoric past.