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On page 15 of the edition of 8 January, you apologise for the mathematical errors in the previous week's report on the RAE results (News in brief). Immediately above this, you report that "more than two thirds (64 per cent)" of parents are friends with their children on sites such as Facebook. Even I spotted that one, and without a calculator. Is this a deliberate ploy to find out if those of us at the back of the class are paying attention?

Paul Probyn, The Royal Veterinary College.