Just when we thought it was safe to put aside the digital/analogue debate this comes along. http://www.bbc.co.uk/news/science-environment-12811199 It's digital - but not as we know it. In such systems the state of a bit can be zero and one at the same time. A computer designed by Charles Saunders Pearce or Lofti Zadeh then... Best Simon Simon Biggs [log in to unmask] http://www.littlepig.org.uk/ [log in to unmask] http://www.elmcip.net/ http://www.eca.ac.uk/circle/