5 • Life Cycles • [Editorial (Analog)] • essay by The Editor8 • Solo Kill • novella by William E. Cochrane [as by S. Kye Boult ]52 • Lunchbox • shortstory by Howard Waldrop57 • The Analytical Laboratory: February 1972 (Analog, May 1972) • [The Analytical Laboratory] • essay by uncredited59 • Celestial Mechanics • [Science Fact (Analog)] • essay by Rowland E. Burns86 • A Transatlantic Tunnel, Hurrah! (Part 2 of 3) • serial by Harry Harrison138 • The Observer • shortstory by Clifford D. Simak147 • In Times to Come (Analog, May 1972) • [In Times to Come (Analog)] • essay by uncredited149 • Mirror Image • [Elijah Bailey / R. Daneel Olivaw] • shortstory by Isaac Asimov163 • The Reference Library (Analog, May 1972) • [The Reference Library] • essay by P. Schuyler Miller168 • Brass Tacks (Analog, May 1972) • [Brass Tacks] • essay by uncredited
