Question: What is the slogan of the magazine which includes the comic strip Goofus and Gallant?
Sentence (from "Mark Alan Stamaty"): He is the creator of the long-running comic strip "Washingtoon", as well as the earlier comic strip "MacDoodle Street", and the online strip "Doodlennium" for "Slate" magazine He is also a spot illustrator for "Slate".
Relevant evidence: No