This episode's headline: Fractured Nation; Stimulating Science. ANCHOR: JIM LEHRER; GUESTS: ALEX DUPUY; ROBERT MAGUIRE; KATHERINE SKIBA; MORDECAI GERSTEIN; CORRESPONDENTS: KWAME HOLMAN; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; KWAME HOLMAN The recording of this episode is incomplete, and most likely the beginning and/or the end is missing.