The Simpsons is one of the most iconic and longest-running shows on television. The famous show about the yellow-skinned family of Homer, Marge, Bart, Lisa, and Maggie (and their many pets, such as Santa’s Little Helper) has given us a glimpse into the life and antics of the Simpson family and the other Springfield residents (and occasionally nearby adversary Shelbyville). For decades now, The Simpsons has provided a valuable social commentary and given people around the world – from Canada to Germany to Saudi Arabia – a common point of discussion. (Though, the family has a different name and many parts are edited out in the latter country – a point discussed more in #19.) This list introduces a variety of Simpsons facts which you probably don’t know but have wondered about – basic questions like “Where is Springfield?” and “Why are all the characters yellow?” to more elusive questions like “Where did ‘D’oh!’ come from?” and “Who has been the highest-profile celebrity to appear on the show?” If you’re curious to learn more about one of the world’s favorite dysfunctional families – still running strong after 27 seasons – check out our list of 25 Simpsons Facts You Probably Never Knew About.