"Sure, sir."

The mess boy turned and continued down the passageway. Jerry shut the door slowly, then sat down in his chair once more, and stared at the clock, and sipped the hot coffee, and fought the cold needle-pricks of fear in every muscle and joint of his body....

II

The colony on the second planet of Sirius existed solely due to one of those vicious circles of progress. Just as iron is needed to make the steel to build the tools and equipment necessary to mine the raw iron ore, so this colony was needed to mine the precious mineral that made such colonies possible in the first place.

The mineral was called Praesodynimium, a polysyllabic mouthful which meant simply that it was an unstable crystalline isotope of sodium that broke down eventually into ordinary sodium (hence "prae-":before; "sod-":sodium), which was possessed of extreme kinetic potentials ("dyn-":power), and was first extracted from sodium compounds by a Canadian scientist ("-imium" instead of the more American "-inum" or even "-um").

This crystal had the happy habit of electrical allergy. When subjected to even a mild electric current, it avoided the consequent shakeup of its electronic juxtaposition by simply vanishing from normal space until the power was turned off. The nice part about its disappearance—from an astronaut's point of view—was that the crystal took not only itself, but objects within a certain radius along with it. It turned out that a crystal of Praesodynimium the moderate size of a sixteen-inch softball would warp a ninety-foot spaceship into hyperspace without even breathing hard. Of course, it would warp anything else within a fifty-foot radius, too; so it was only turned on after the ship had ascended beyond planetary atmosphere, lest a large scoop of landing-field, not to mention a few members of the ground crew, be carried away with the ship.

In her eagerness to investigate the now-attainable stars, Earth had soon exhausted her sources of the mineral. Worse, the crystal, being unstable, had a half-life of only twenty-five years. That meant that a ship using it had a full-range radial margin of about five years before the crystal ceased warping the ship-inclusive area.

Until some way was discovered to get into hyperspace without using Praesodynimium—and its actual function was as much a mystery to scientists as an automobile's cause-and-effect is to a lot of drivers; very few people can describe the esoteric relationships 

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