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What's OnStar's dyslexia boostHAPPY Days star Henry "the Fonz" Winkler spoke at Downing Street yesterday of his struggle with dyslexia as a campaign aimed at boosting the confidence of youngsters was launched.By The NewsroomPublished 6th Jan 2010, 21:34 BSTUpdated 6th Jan 2010, 22:06 BST .Related topics:Downing Street