"The Jovians wanted to reduce Earth to colonial status, to be exploited for its natural resources," John explained to his companions as they walked. "All atomic installations were destroyed, all technicians and scientists exterminated systematically and all scientific books burned. They were very thorough about it. "The successful revolt was accomplished with a concealed stock-pile of atomic weapons. Since that time, they've been garrisoned against the return of the Jovians. But atomic power was gone and so were the scientists who could bring it back and the books from which new scientists could learn. "It's because they can't replace even so small a thing as an electric light bulb that destruction or unnecessary use of any sort of equipment is the rankest sort of treason. They've been saving all their technological capital for a last-ditch stand against the expected invasion. "And it was their faulty, groping sort of maintenance that saved our lives, because even a heat-gun deteriorates in 150 years. That gun hadn't been fired since the Revolt!" "Then we can be their salvation?" suggested Phil. "Yes. The scientists who built the Deneb colony can rebuild the technology of our own Earth. It will take a long time ... there'll have to be schools and we'll all have to work hard ... but maybe some of us will be able to go back, in 30 or 40 years, say, when the Discovery can return to Deneb." They were nearing the ship, and John saw the officers crowding the main port, watching them come. "It's sort of inconsequential, I know," said Ann then. "But several times the Third Sarge referred to us as 'deevs.' Did he mention to you what a deev is?" John smiled. "It's an ancient military slang term, just like 'sarge' and 'topkick,'" he replied. "'Deev' is just plain old D.V. Distinguished Visitor. And I suppose we are, at that." End of the Project Gutenberg EBook of Conservation, by Charles L. Fontenay