According to Cybermetrics Lab’s semiannual ranking, U.S. universities once again lead as sources of high-quality, open-access Web content. Harvard, the Massachusetts Institute of Technology, Stanford, and U.C Berkeley take the top four ranking slots, with Cambridge the only non-U.S. university in the top 30. The University of Toronto, the University of British Columbia, and ETH Zurich (40th) are the only non-US schools in the top 40.Source: University World News