mid-sentence: ... Pardon the preaching, Les. Human nature and everything else seems booby-trapped. They drummed the idea of courage and careful thinking into us at school. Because so much that is new and changing is a big thing to handle. Still, we'll have to stick to a course of action. Now Ed sat with his elbows on his table, that other, no longer quite blank, sheet of paper held lightly in his hands. He sat there, a stocky young man, his hair cut short like a hedge, the clues of his existence around him: student banners on the walls; a stereoptic picture of his track team—in color of course; ditto for his astrophysics class; his bookcase; his tiny sensipsych set; and the delicate instruments that any guy who hoped to reach the next human goal, the nearer stars, had to learn about. His girl's picture, part of any youth's pattern of life for the last three centuries, smiled from beside him on the table. Dark. Strong as girls were apt to be, these days. Beautiful in a rough-hewn way. But even with all that strength to rely on, he was worried about her more than ever now. Times were strange. He glanced at her likeness once. Then his gaze bounced back to the paper in his hands. His nerves tingled at the eerie thing that was happening there. He didn't know whether to feel afraid of it or hopeful. Man was stumbling toward ultimate mastery of his own flesh and the forces of the universe. But the distance remained enormous, though technical science was moving forward, perhaps too swiftly, on all fronts. Part of Ed's fear before the unknown was like the stage fright of an inexperienced actor. You never quite knew what was ahead or how to judge anything strange that you saw. "Nippe...." At the end of the line which made the "e" there was a tiny speck of blue ink. Almost imperceptibly, like the minute hand of a clock, it crept on, curving and looping to form another letter. "Nipper" the word was now. This could be somebody's funny gag, Ed thought. Somebody with a gadget. The world is full of gadgets these days. Maybe too full. It occurred to him that a pal might be playing a joke with some simple device bought in a novelty store. But probability leaned toward something deeper and more costly. Who knew? Someone might have invented a way to make a man invisible. You didn't deny that anything could be, any more.