Oxford and Cambridge universities have fallen slightly in the world's university rankings.
Last year they tied for second place with Yale university in the United States.
But this year, Harvard in the US is top, Yale second, with Cambridge in third place and Oxford in fourth place.
Two other British universities are in the top ten, the same number as last year.
Imperial College London fell from fifth to sixth place, while University College London rose from ninth to seventh.
In total, 17 universities in Britain made it into the top 100 list, down from 19 last year.
The rankings of 200 top universities have been published by the Times Higher Education Magazine , with research conducted and compiled by QS Quacquarelli Symonds.
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