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What do the following have in common: Freddie Mercury, Louis Braille, Olga Ladyzhenskaya and Veterans' Day? They've all been the subject of Google Doodles - those witty and often thought-provoking reworkings of the classic Google logo that greet you when you first click onto the search engine. Google's Art Director Matt Cruickshank tells Fergus Nicoll about its core purpose. Picture: Jane Goodall, who has dedicated her life to studying and protecting our environment, features in a Google doodle (Credit: Google)