I think one of the most popular classes offered is the Descriptive Astronomy. It seems like the class fills up extremely quickly whenever I try to take it. I'm not really an expert on popular classes, but other pretty popular classes are Film Appreciation, it filled up pretty quickly (but that might be because it is one of the better art appreciation classes you can take a UCA.). Those are a couple of really popular classes, but I am sure there are more, and it also depends on what you chose to major in!
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