In a recent interview with Steve Martin on NPR's Fresh Air, host Terri Gross asked her guest: "Do you remember the point in your career, when people started to realize that you are smart?" The host was referring, of course, to Martin's zany comedic roles that qualify him as a loveable nut. After all, it is tough to equate "King Tut" from Saturday Night Live, as an author of fairly serious reput...