This week on Car Talk, medical school student Christine is having a little trouble remembering things--happily, she's not leaving any forceps in patients, but she is repeatedly leaving her keys locked in her Camry. Does she need to gift all of her classmates with copies of her key? Elsewhere, Judy and her husband went car shopping and agreed on everything except the color. So who better to ask to adjudicate than two guys who are color blind? Also, Jose hopes his MIT degree has prepared him to tackle a leaky valve cover; Sarah faces one more Anchorage winter with a recalcitrant heater; and on Stump the Chumps we welcome back Dickie, who couldn't figure out why water was shooting out of his girlfriend's steering column. All this, plus a new Puzzler from the Matchstick series, and lots more, this week on Car Talk.