Hi Lightman, and welcome to Photonlexicon.
Please take a moment to fill out your profile, particularly your location. We have members here from all over the world and it helps us to help you if we have a clue as to your whereabouts.
Cheers
Jem
Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.”... Douglas Adams 1952 - 2001