 What is NOT a technological/social advancement involved in this story?
Safe from the scrutiny of brothers and parents, there was nothing now to stop him from going to the ocean. It was exactly as he knew it would be: the milky-orange stream had become motionless and its minute whirlpools had stopped whirling; a nearby bee hung suspended over a paka plant, its transparent wings frozen in position for a downward stroke; and the heavy purple fluid overhead held fast in its manufacture of whorls and nimbi. With everything around him in a state of perfect tableau, Purnie hurried toward the ocean. He ran along feeling sorry for four-year-olds, and even for those who were only four and a half, for they were babies and wouldn't dare try slipping away to the ocean alone. Rather than spoil what was clearly going to be a perfect day, he chose to ignore the fact that he had been forbidden to use time-stopping as a convenience for journeying far from home. He chose to ignore the negative maxim that "small children who stop time without an adult being present, may not live to regret it." The ocean lay at the ready, its stilled waves awaiting his command to resume their tidal sweep. Overhead, a flock of spora were frozen in a steep glide, preparatory to a beach landing. Further down the beach was a pair of two-legged animals poised in mid-step, facing the spot where Purnie now stood. Some distance behind them were eight more, each of whom were motionless in a curious pose of interrupted animation. When he got no reaction, he remembered that he himself was "dead" to the living world: he was still in a zone of time-stopping, on the inside looking out. For him, the world would continue to be a tableau of mannikins until he resumed time. It was time itself that Purnie had stopped, not the world around him. Sure, it's your money that put us here; it's your expedition all the way. Your new piece of real estate is going to make you so rich that you can buy your next planet. We've found low-grade ore on every planet I've discovered so far, and this one'll be no different. "There is, there is. And if I'm not mistaken, you've set up a neat little escrow system so that you not only own the planets, but you will virtually own the people who are foolish enough to buy land on them."
 Teleportation
 Radiation impacting life forms  Time travel  Teleportation  Colonization of other planets