Four of the world's top 40 universities are in London,according to the Times Higher Education rankings - although only one makes it into the top 10.
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On the lawns of the palace, thousands of people stood silently in tribute to the 22 people killed in the blast and the 59 injured.
James Bond star Sir Roger Moore has died at the age of 89, his children have announced.
Wembley Stadium, Wimbledon and The O2 have been bolstering security measures.