Gradually he came out of the dream-like period, learning of what had happened. Until the time when he walked from the sick-bay, unsteadily, but on the mend. Alice, at his elbow, spoke: "It was like Doc Kramer planned, Bert, solving the hardest problem." He knew what this meant. Transmutation, or any atomic process, must involve the generation of much radioactivity that can destroy life. In the Big Pill, the problem was to make all the atoms break, and rearrange their components into new elements as cleanly and sharply as possible, so that residual atomic instability--radioactivity, that is--would not linger for years, but would disappear quickly. "Titan's new atmosphere is clean and breathable, now, Bert," Alice went on. "And likewise the radioactive poisons that made you and Lawler and the others very ill disappeared quickly from your bodies. However, two colonists were beyond saving." Lawler was with the Kraskows. They went out of the ship without the cumbersome protection of spacesuits. A Space Patrolman hovered like a worried hawk, watching Bert, but the latter seemed not to mind. Far above, replacing the hard stars and blackness of space, common to the firmaments of all dead and near-dead worlds, were great fleecy clouds and blue sky. The atmosphere, because of Titan's low gravity, was highly expanded and hence thin, but rich in oxygen. The breeze smelled cool and fresh. Overhead was a second sun, seemingly much larger in diameter than the distant central orb of the solar system. It crept with visible motion across the sky. It was the molten globe of what had been the _Prometheus_ and its cargo, locked in its sub-lunar orbit around Titan. But it was calculated to provide sufficient warmth and light to a small world such as this, for ten Earth-years, without renewal. Colonists were clearing away the wreckage of the now useless airdomes, and putting their cottages in order. But they still looked around in awe at the miracles that ended their space-nostalgia, making them feel truly at home here. Down in the valley there was even a great lake of rainwater from condensed steam--one of the end-products of the process that had gone on in the rocks of the great crater on the other side of Titan. That process had died to a sleepy smoking, now; but all over this moon of Saturn there were many lakes. Big Lawler chuckled gleefully, the sound rumbling deep in his chest. "Rejuvenation of burnt-out spheres on a really progressive basis," he growled. "No obsolete, jury-rigged junk! Expensive? Sure! But we can pay for it! Out there are Saturn's metal-rich Rings!" Bert was thinking that the same trick could be used on any world with enough gravity to hold down a respectable atmosphere. Half-dead Mars. Jupiter's four biggest moons. Some of the other satellites of Saturn. Mercury.