One of my favorite videos on the internet is this one, featuring Arsenal legend Ian Wright’s story of Mr. Pigden, the primary school teacher in South London who genuinely changed his life — and the moment in 2005, some years after Wright’s retirement, when the two of them were reunited. If you ever doubt that teachers can make a difference, watch this video. It’s such a beautiful scene: Wrighty stands looking around the pitch at Highbury, smiling in memory of his great accomplishmen...