This week on Car Talk, Kathy is "helping" her son build his Pinewood Derby race car, and is looking for a few design tips. Can two MIT grads-- one of whom failed Physics twice-- lead her to Victory Row, or is this Cub Scout Den Mother barking up the wrong radio show? Elsewhere, Sophie thinks her Saab is laughing at her, and not just because it's delighted by her French accent; Ainsley's husband won't let her take her Honda to the car wash because he's worried it'll melt the Epoxy that's holding the car together; and Richard won Employee of the Month by driving 95 mph to deliver his boss' passport to the airport. But, will he be forced to sell his plaque to fix the problems that have plagued his Jeep ever since? And, our Historic, Folkloric Question of the Week comes from Julie: why do we drive on the right, if we're a former British colony? All this, and lots more, this week on Car Talk.