GREY'S ANATOMY - "The Heart of the Matter" - The Chief's wife, Adele, rushes their niece to Seattle Grace, the hospital where she once had her prom, Izzie reveals her feelings for George to a mutual friend, and the reaction is not what she expects, Derek teaches Cristina how to be a better teaching resident, and the world's oldest living intern, Norman, misdiagnoses one of Meredith's patients, on "Grey's Anatomy," THURSDAY, OCTOBER 18 (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/RON TOM) CAMILLE WINBUSH