This episode's headline: Campaign for Kosovo; High School Horror; NATO At War; Teachers' Views. ANCHOR: JIM LEHRER; GUESTS: PRESIDENT SULEYMAN DEMIREL, Turkey; GEORGE PAPANDREOU, Foreign Minister, Greece; PRESIDENT CLINTON; ANDY BAUMGARTNER, National Teacher of the Year; PETER WHITE, New York Teacher of the Year; JANICE JAMES, Kentucky Teacher of the Year; MARY LYNN PEACHER, Oklahoma Teacher of the Year; CORRESPONDENTS: TOM BEARDEN; BETTY ANN BOWSER; TERENCE SMITH; PHIL PONCE; MARGARET WARNER; KWAME HOLMAN; PHIL PONCE; ELIZABETH FARNSWORTH; JEFFREY KAYE; SPENCER MICHELS