These agglomerations in metropolitan areas leads to what experts call knowledge spillovers, which is simply defined as the exchange of ideas among individuals. The physical proximity of entities allows for the rapid exchange of knowledge, ideas, expertise, and people. A common example of knowledge spillovers is a business park, where many businesses that often have no relation locate in the same complex and benefit simply from each other's presence. This is extremely similar to university agglomerations – colleges and universities that have no special relationship often benefit simply from having other institutions of higher education near them for easy exchange of ideas, resources, and opportunities between faculty and students. An extreme example of this is the Claremont Colleges, located in Claremont, California. At the Claremont Colleges, five undergraduate liberal arts colleges and two graduate institutions are all located right across the street from one another, thus enabling students from each college to interact with students from the other colleges socially and in clubs. Further, as the Claremont Colleges do cooperate with one another, students are able to cross-register in classes at the other colleges, eat in the other college's dining halls, and further benefit from enhanced shared resources like the Honnold-Mudd Library, Student Health Services, and Campus Safety.