This week, the Paley Center for Media, at its locations in Manhattan and Beverly Hills, begins almost two months' worth of programs celebrating Temple trustee and alumnus Bill Cosby's 50 years in show business. Focusing on Cosby's TV work, NYT columnist Neil Genzingler chose five "less-well-known vignettes as examples of what has made Mr. Cosby so good for so long." The vignettes include his appearance on Sesame Street in 1970 reciting the alphabet and a scene from "The Bill Cosby Show" from the 1970s when Cosby spent the entire episode stuck in an elevator with Henry Fonda. The most recent had Cosby talking about his football-playing days in college with David Letterman.