How do you solve the problem of human happiness? Its a subject that has occupied some of historys greatest thinkers, from Aristotle to Paul McKenna. But how do we sort the good ideas from the bad ones? In the last five years Oliver Burkeman has travelled to some of the strangest corners of the happiness industry to find out. Paperback , 273 pages Published October 1st 2011 by Canongate Books (first published December 12th 2010)