"Susan Stamberg conducts this guided tour through the best of NPR - two hours of the brightest moments from twenty years of distinguished programming.  Among the excerpts:  Laurence Olivier's secret for acting; a Nazi rally in Chicago;  a walk on an Alaskan glacier;  searching for truffles;  an ascent of Mt. Everest;  Dvorak and revolution in Prague;  Little Richard;  and a sunset.  It all adds up to a stunning evocation of what's finest in radio."