I am not an engineer! Important to get that one out of the way from the outset. But life has led me into areas that require exceptionally gifted engineers (namely alternative energy solutions) and I think a daily scan of this site and the comments from contributors will be very enlightening. It would be presumptious to think I will be able to contribute anything new or of much value to your discussions, but I hope you don't mind my listening in in the hope of learning more about technology that is so critical to our planet's recovery.