The title illustrates the twinned articles by deCamp and Heinlein, discussing the past and the future of flight. CONTENTS:.. The Demolished Man (Part 2 of 3) [Alfred Bester].. Conditionally Human [Walter M. Miller, Jr.].. Double Standard [Alfred Coppel].. Dr. Kometevsky's Day [Fritz Leiber].. Fresh Air Fiend [Kris Neville].. Open Letters [H. L. Gold].. Where Were We? (Article) [L. Sprague de Camp].. Where To? (Article) [Robert A. Heinlein]