>> you'd be shocked, actually. i think it's some of the customer service. >> reporter: this is dr. rebecca merrill. but you can imagine right now going and learning auto mechanics? >> no, but carl said he would do ar oil changes. >> reporter: fortunately, carl now has more important repairs on his mind. but this old auto mechanic also knows whether you're work under rehood or staring under a ratch... >> i'll have you open up your mouth really wide. >> reporter: your success hinges on your drive. >> i would hear people say, "well, carl, it's going to take nine years to become a doctor." and i would say, "nine years are going to pass anyway, so i would rather be someplace i want to be than someplace that i could have been." >> reporter: and there's the prescription for the i-can't-do- it blues. steve hartman, "on the road," in akron, ohio. >> garrett: that's the cbs evening news. i'm major garrett. norah will be back on monday. in the meantime, have a great weekend and good night.