Map of scientific collaboration between researchers
http://flowingdata.com/2011/01/27/map-of-scientific-collaboration-between-researchers
scientific collaboration around the world from 2005 to 2009:
From an extensive database of academic citations:
I extracted and aggregated scientific collaboration between cities all over the world. For example, if a UCLA researcher published a paper with a colleague at the University of Tokyo, this would create an instance of collaboration between Los Angeles and Tokyo.
http://flowingdata.com/wp-content/uploads/2011/01/Collaboration-in-Europe-575x470.jpg