I am an old married man and have a daughter and a son and five grandchildren. I live in Stockholm, Sweden. I have a masters degree in electronics. I studied extra tensor calculus and general theory of relativity and enjoyed it. Then I worked with IT as technician, project manager, and manager. I like theoretical physics, languages, playing classical guitar and alto guitar, and physical yoga. Now my interest in physics is active again. I am particularly interested in quantum mechanics, elementary particle physics, electrodynamics, string theory, and mathematics.