One of the most important issues concerning the organization of research and higher education concerns their interaction. The most common form that this relationship of research and education takes in our time and age is to have both functions combined in universities, often referred to more specifically as research universities. This form of organization is more recent than one perhaps might first think, and even at this time there are exceptions to this form of organization. In natural sciences and medicine there are industrial laboratories for research without teaching. In some countries, especially in Russia, there exists an extensive hierarchical institution almost entirely dedicated to research rather than teaching, called an academy of sciences. The members of such academies can devote themselves entirely to research without any teaching duties, except perhaps on the level of dissertation advising. Other exceptions include some rare graduate or research institutions, for instance Rockefeller University, All Souls College, Oxford, and some institutes of advanced study. But such exceptions are few and far between, at least in Western Europe and the Americas. Thus by far the most common relationship, especially in the humanities, of research and teaching is to have them conducted by the same people at the same institution, usually called a university.