Calvin subscribes to a magazine devoted to an activity that many (including Hobbes) would find mundane and unworthy of such "high-gloss, literate and sophisticated" treatment. With this gag, creator Bill Watterson appears to be satirizing the commercialization and exhaustive over-examination of hobbies by their associated periodicals. What is the name of Calvin's magazine OR the activity that it covers?
Chewing, Gum chewing