Introduction / Morton F. Kaplon -- 1. Galileo in the present / Giorgio de Santillana -- 2. Galileo's influence in modern society / Gilberto Bernardini -- 3. Galileo's real discoveries in dynamics / Norwood Russell Hanson -- 4. Galileo on measurement / Edward W. Strong -- 5. Science and government / Philip H. Abelson -- 6. Science and history / Erich Kahler