<p>Up to the age of forty-seven, Graham lived a full and successful life. Then disaster came in the form of a life-changing stroke. Closing down his business, moving from his home and finding himself single, Graham had to somehow find the strength to carry on, including learning how to walk again.<br><br>During this time, he was reminded of a theory he had had many years earlier - that of the power of positivity - and here he expounds on his uniq...