1) Harvard University (US)
2) University of Cambridge (UK)
3) Yale University (US)
4) UCL (University College London) (UK)
5) Imperial College London (joint with Oxford) (UK)
6) University of Oxford (joint with Imperial) (UK)
7) University of Chicago (US)
8) Princeton University (US)
9) Massachusetts Institute of Technology (US)
10) California Institute of Technology (US)
Source: inthenews.co.uk