This week on The Best of Car Talk, Tom gets the rare opportunity to fail Physics a third time as he and Ray try to help Kathy “help” her son design his Pinewood Derby race car. Elsewhere, Bridget’s car is making a whisking sound that’s only a little less scary than Tom and Ray’s attempts to mimic it; Pam’s Volvo is smoking more than her husband and arousing the ire of the Amherst, VA police department; and Johnny’s attempt to fix his Jeep may require him to avoid wearing rayon pants. Also, new research that demonstrates the male brain’s oscillation between pure genius, and pure incompetence. All this and more, this week on The Best of Car Talk.