1        Harvard UniversityUnited States

2        University of CambridgeUnited Kingdom

3        Yale UniversityUnited States

4        UCL (University College London)United Kingdom

5        Imperial College LondonUnited Kingdom

5        University of OxfordUnited Kingdom

7        University of ChicagoUnited States

8        Princeton UniversityUnited States

9        Massachusetts Institute of Technology (MIT)United States

10        California Institute of Technology (Caltech)United States

11        Columbia UniversityUnited States

12        University of PennsylvaniaUnited States

13        Johns Hopkins UniversityUnited States

14        Duke UniversityUnited States

15        Cornell UniversityUnited States

16        Stanford UniversityUnited States

17        Australian National UniversityAustralia

18        McGill UniversityCanada

19        University of MichiganUnited States

20        University of EdinburghUnited Kingdom

20        ETH Zurich (Swiss Federal Institute of Technology)Switzerland