The University of Oxford is the oldest university in the English-speaking world. Teaching has taken place at Oxford since 1096. Oxford has the largest volume of world-leading research in the country, rating top in the REF power rankings published by Research Fortnight. Oxford’s research involves more than 70 departments, almost 1,800 academic staff, more than 5,000 research and research support staff, and more than 5,600 graduate research students. The University has 38 independent colleges to which undergraduate and graduate students belong. Oxford has the highest research income from external sponsors of any UK university: £478.3m in 2013/14. The University has pioneered the successful commercial exploitation of academic research and invention, creating more than 100 companies, and files more patents each year than any other UK university.