This is something that was passed on to me today, and it is extremely interesting. There are 5 parts to it, and I was so impressed I watched all five straight off! It gets a bit heavy going in places, but it is well worth watching. In fact I've bookmarked it as I'm sure I'll want to look at it again. http://www.worldsciencefestival.com/video/notes-neurons-full -- Will J Godfrey http://www.musically.me.uk