Contents: 4 "A Second Chance," editorial by Stanley Schmidt 12 "The Invariants of Nature," by Charles Sheffield 46 "Hit and Run," by Jerry Oltion 62 "Goat Island," essay by L. Sprague de Camp 80 "Conspiracy Theory," by Ben Bova 86 "Spoiled Rotten," by Grey Rollins 107 "The Fashion of Physics," poem by Marianne J. Dyson 108 "Science and SF in Japan," essay by John G. Cramer 114 "Squatter's Rights (Part 2 of 2)," by Maya Kaathryn Bohnhoff 160 "The Reference Library," essay by Thomas A. Easton 167 "In Times to Come," uncredited essay 176 "Upcoming Events," essay by Anthony R. Lewis