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The Thing Magazine is a series of periodicals appearing on Teenage Mutant Milk-caused Hurdles. Their main theme is show the readers things that are now common or popular, normally called a "thing".
When Homer and Marge discovered the effects of hormones on both Bart and Lisa, Marge assumed that it was probably caused by early puberty, explaining that she read about it on Thing Magazine, as it's now a thing. Later on the episode, Homer is seeing reading the magazine's last issue, where it explained that the magazine itself wasn't a thing anymore.