The others had plenty to sweat about. Joe and Haney and the Chief were acting as instructors to the Moonship's crew. They taught practical space navigation. At first they thought they hadn't much to pass on, but they found out otherwise. They had to pass on data on everything from how to walk to how to drink coffee, how to eat, sleep, why one should wear gravity harness, and the manners and customs of ships in space. They had to show why in space fighting a ship might send missiles on before it, but would really expect to do damage with those it left behind. They had to warn of the dangers of unshielded sunshine, and the equal danger of standing in shadow for more than five minutes, and---- They had material for six months of instruction courses, but there was barely a week to pass it on. Joe was run ragged, but in spite of everything he managed to talk at some length with Sally. He found himself curiously anxious to discuss any number of things with his father, too, who suddenly appeared to be much more intelligent than Joe had ever noticed before. He was almost unhappy when it was certain that the Moonship would take off for space on the following day. He talked about it with Sally the night before take-off. "Look," he said awkwardly. "As far as I'm concerned this has turned out a pretty sickly business. But when we have got a base on the Moon, it'll be a good job done. There will be one thing that nobody can stop! Everybody's been living in terror of war. If we hold the Moon the cold war will be ended. You can't kick on my wanting to help end that!" Sally smiled at him in the moonlight. "And--meanwhile," said Joe clumsily, "well--when I come back we can do some serious talking about--well--careers and such things. Until then--no use. Right?" Sally's smile wavered. "Very sensible," she agreed wrily. "And awfully silly, Joe. I know what kind of a career I want! What other fascinating topic do you know to talk about, Joe?" "I don't know of any. Oh, yes! Mike got a letter from his girl. I don't know what she said, but he's walking on air." "But it isn't funny!" said Sally indignantly. "Mike's a person! A fine person! If he'll let me, I'll write to his girl myself and--try to make friends with her so when you come back I--maybe I can be a sort of match-maker." "That, I like!" Joe said warmly. "You're swell sometimes, Sally!" Sally looked at him enigmatically in the moonlight. "There are times when it seems to escape your attention," she observed. * * * * *