The project of establishing a European community since World War II has been further advanced by adding - besides the four freedoms of free movement of goods, persons, services and capital - a fifth freedom -- the free circulation of researchers, knowledge and technology -- that intends to promote community building at the level of higher…

As recently as the early 1970s, a postdoctoral research experience overseas was a valued part of training for a U.S. biologist aspiring to an academic position. Not only did the U.S. scientists benefit educationally from participating in different laboratory and cultural systems, but labs outside the United States were enriched by the ideas,…