Weirder maths : at the edge of the possible

Even the most enthusiastic of maths students probably at one time wondered when exactly it would all prove useful in 'real life'. Well, maths reaches so far and wide through our world that, love it or hate it, we're all doing maths almost every minute of every day. David Darling and Agnijo Banerjee go in search of the perfect labyrinth, journey back to the second century in pursuit of 'bubble maths', reveal the weirdest mathematicians in history...