This episode's headline: Earthquake Warning Signs; People Express: Buying Low; Eternal Harvest?. The guests include In Pasadena, California: CLARENCE ALLEN, California Institute of Technology; In New York: DAVID LEWIN, Columbia University; JULIUS MALDUTIS, Airline Analyst; In Syracuse, New York: ALFRED KAHN, Cornell University; REPORTS FROM NEWSHOUR CORRESPONDENTS: SPENCER MICHAELS (KQED); CHRIS HARDY (Visnews), in Israel; JEFFREY KAYE (KCET), in California; JIM FISHER (Kansas City Times), in Kansas. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor