I came here by accident. Being interested in physics i browsed the net and came across physicsforums. Signing up was free so..... I do have somewhat a background in physics. I have a masters degree in physics. professionally i followed a career as a programmer in SAP ABAP most recently and already for many years. I do not expect to be able to contribute much frankly. My knowledge of elementary particle physics and solid state physics has diminised more and more the past decades ( i am now 59 ). Especially the mathematics involved is again a mistery for me.