According to a recent piece in the prestigious Journal of the American Medical Association, prospective doctors can learn critical reasoning skills from Car Talk:
"The cognitive task of the mechanic is virtually identical to that of the physician: both use history, examination, and tests to diagnose and repair a complicated machine in the context of a human relationship. Students who listen to Car Talk can appreciate the fundamentals of problem solving and reasoning that serve both the mechanic and the physician."
Dhaliwal, Gurpreet, "The Mechanics of Reasoning", JAMA. 2011;306(9):918-919.