TV presenter, mathematician and comedian Johnny Ball appeared at the Apple Store, Covent Garden to talk about his new book, Ball of Confusion: Puzzles, Problems and Perplexing Posers, before answering questions from the audience. Johnny Ball first rose to fame as a comedian in the 1960's. In the late 1970's and 1980's he became TV's best-loved mathematician presenting the iconic 'Think of a Number' for the BBC and 'Johnny Ball Reveals All' on ITV. Johnny was interviewed by the Gadget Show's Jason Bradbury. The event took place on Thursday, 20th October, 2011 at 7pm.