1; Massachusetts Institute of Technology (MIT) 2: University of Oxford 3:Stanford University, 4:University of Cambridge 5: Harvard University 6: California Institute of Technology 7:Imperial College London 8: UCL 9: ETH Zurich 10: University of Chicago 11: National University of Singapore (NUS) 12; Peking University 13: University of Pennsylvania 14: Tsinghua University 15; The University of Edinburgh