Intelligent, passionate, and the moral center of the family, Lisa Simpson, at eight years old, is the second child of Homer and Marge, younger sister of Bart, and older sister of Maggie. Lisa's high intellect and liberal political stance creates a barrier between her and other children her age, therefore she is a bit of a loner and social outcast. Lisa is a vegetarian, a strong environmentalist, a feminist, and a Buddhist. Lisa's character develops many times over the course of the show: she becomes a vegetarian in season 7 and converts to Buddhism in season 13. A strong liberal, Lisa advocates for a variety of political causes (e. g. standing with the Tibetan independence movement) which usually sets her against most of the people in Springfield. However, she can also be somewhat intolerant of opinions that differ from her own, often refusing to consider alternative perspectives. In her free time, Lisa enjoys many hobbies such as reading and playing the baritone saxophone, despite her father's annoyance regarding the latter. She has appeared in other media relating to The Simpsons – including video games, The Simpsons Movie, The Simpsons Ride, commercials and comic books – and inspired a line of merchandise.