I'm sorry that I have been busy with other topics, like John Lash, who was introduced by Sue Otness some weeks ago. She gave me a pdf of his book.
R2d2 is a robot, though, I did study electronics in the 1980's. It was mostly a philosophical study on how the circuitry resembles DNA electrochemical design, which I discovered recently.
My education is dependent upon my health issues, so, I read when I can do so without some pain. Pain distracts my focus. Fatigue is my biggest drain of energy. I work 40 hours and the weekend is my recuperating time. Yet, the days are fast now. And I spend time on the Forum.