Background is done, now starting geometrics on 3rd in my New series. It takes a long time, there will be so much more detail and then at the end I'll implement in some physics. On a side note, my oldest daughter has been completing her college applications. She wants to major in research chemistry. Applying to UCI, UCLA, Cal Poly SLO, CSULB, Azusa Pacific. The process is daunting. But I'm a pretty proud mom. She's worked so hard for so long. Good luck Tara.