I was listening to an early episode of Radiolab yesterday which examined how we identify ourselves. Identify ourselves as being uniquely different from other people, that is. How when see ourselves in the mirror, we've learnt since childhood that it's us and so on. At some point in the programme they had a neuroscientist talk about how the brain works and when he was asked where the soul is, he said there is no soul. Whatever it is about you that would constitute whatever it is you perceive to be a soul, is merely a story about you, presumably drawn from your memories, that you've told yourself. Of course, someone who doesn't have your memories, or has different memories of you, would perceive your soul to be different to the way you see it. It's worth thinking a bit about, for several reasons. Firstly, the concept of a soul was devised by the ancient Greeks, who believed the heart controlled our thoughts and was the essence of our "soul", but they've since discovered it's just a pump and the brain is the bit that manages our thoughts and functions. Secondly, whatever it is that makes us individuals can change completely if we suffer a brain injury. Everything about your personality can change under such circumstances, so who are you then? Would St Peter recognise you from the notes in the little black book they reckon he keeps about you? Who wants to pick this up and run with it?