When I attended a California UC and CSU university, I met some seniors who were getting a engineering degree just for fun. At that time I think California senio

When I attended a California UC and CSU university, I met some seniors who were getting a engineering degree just for fun. At that time I think California seniors could attend courses with no tuition. This was all 20-30 year ago. I think that is still true for the CSU system but not sure about UC system. I had some interesting conversation with some individuals. One used to work for engineers in the Navy and wanted to understand more of what they did. Another was involved in some early work on lithium battery technologies and wanted to understand software engineering.