Produced by Greg Weeks, Stephen Blundell and the Online Distributed Proofreading Team at https://www.pgdp.net YOUTH _by_ ISAAC ASIMOV Red and Slim found the two strange little animals the morning after they heard the thunder sounds. They knew that they could never show their new pets to their parents. [Illustration] There was a spatter of pebbles against the window and the youngster stirred in his sleep. Another, and he was awake. He sat up stiffly in bed. Seconds passed while he interpreted his strange surroundings. He wasn't in his own home, of course. This was out in the country. It was colder than it should be and there was green at the window. "Slim!" The call was a hoarse, urgent whisper, and the youngster bounded to the open window. Slim wasn't his real name, but the new friend he had met the day before had needed only one look at his slight figure to say, "You're Slim." He added, "I'm Red." Red wasn't his real name, either, but its appropriateness was obvious. They were friends instantly with the quick unquestioning friendship of young ones not yet quite in adolescence, before even the first stains of adulthood began to make their appearance. Slim cried, "Hi, Red!" and waved cheerfully, still blinking the sleep out of himself. Red kept to his croaking whisper, "Quiet! You want to wake somebody?" Slim noticed all at once that the sun scarcely topped the low hills in the east, that the shadows were long and soft, and that the grass was wet. Slim said, more softly, "What's the matter?" Red only waved for him to come out. Slim dressed quickly, gladly confining his morning wash to the momentary sprinkle of a little lukewarm water. He let the air dry the exposed portions of his body as he ran out, while bare skin grew wet against the dewy grass. Red said, "You've got to be quiet. If Mom wakes up or Dad or your Dad or even any of the hands then it'll be 'Come on in or you'll catch your death of cold.'" He mimicked voice and tone faithfully, so that Slim laughed and thought that there had never been so funny a fellow as Red. Slim said, eagerly, "Do you come out here every day like this, Red? Real early? It's like the whole world is just yours, isn't it, Red? No one else around and all like that." He felt proud at being allowed entrance into this private world. Red stared at him sidelong. He said carelessly, "I've been up for hours. Didn't you hear it last night?" "Hear what?" "Thunder." "Was there a thunderstorm?" Slim never slept through a thunderstorm. "I guess not. But there was thunder. I heard it, and then I went to the window and it wasn't raining. It was all stars and the sky was just getting sort of almost gray. You know what I mean?" Slim had never seen it so, but he nodded. "So I just thought I'd go out," said Red.