Prince William has revealed his connection to the Big Issue magazine and shared that the positive intention to help homeless people and those with low incomes began when he was only a boy of 11 years old.The Duke of Cambridge, who celebrated his 40th birthday on Tuesday 21 June, was taught by his mum Princess Diana to really care about helping people, and he said it was her who inspired him to do it himself.The Duke was spotted selling the long-running magazine on the streets of London recently, in a surprising turn for a member of the Royal family. The dad-of-three was all smiles and eager to get stuck in as he assisted Big Issue vendor Dave Martin in the charity project.