I lived in the US for a few years and did some classes, the guy next to me told me he was auditing the class, which I assumed meant he had been asked to provide feedback on the course to the University. We ended up working together in a group on the final project. After we submitted the lecturer contacted us to ask who he was because he wasn’t registered for the class.

At school I liked Physics……my daughter studies Economics and some of that is very interesting.