Lisa Simpson

Lisa Marie Simpson is a fictional character in the animated television series The Simpsons, voiced by Yeardley Smith. Matt Groening, the creator of the series, named her after his sister.She is the elder daughter and middle child of Homer and Marge Simpson, and the sister of Bart and Maggie. Lisa is an extremely intelligent 8 year old girl, one of the most intelligent characters on the show, with an I.Q. of either 156 or 159. She also plays the saxophone. Lisa's knowledge covers a wide range of subjects, from astronomy to medicine, and she is notably more concerned with world affairs than her life in Springfield. Lisa shares her intellect and overachieving personality traits with other female members of the Simpson family ("Lisa the Simpson" revealed that Simpson male inherit a gene on the Y chromosome that prevents them from using their intellect regularly). Lisa also deeply values her integrity, as demonstrated when she cheats on a test on The Wind in the Willows to attain her... full article at wikipedia