Thus, there exists a network not only of national scientific systems but more and more visibly a network of international dimension. The scientific wealth of nations is to a growing extent their participation and contribution in and to this international trans- and interdisciplinary scientific effort. These are moved by muscles, especially financial means, and scientific instruments as well as scientists and technicians, its blood being the flow of scientists, and knowledge forming its brain.
Resources are important, too, especially money.
Besides, infrastructure is needed, for example big machinery and instruments, buildings as well as technical equipment. In some areas you need natural resources, especially in biomedicine. Last but not least, there is knowledge, incorporated in published and unpublished papers and tacit knowledge within heads and networks. Actors in the Fields of International Cooperation Bringing together heads and knowledge means either training or augmenting science. Fusing money with intelligence produces experts and expertise.