In an hour, Paul Grayson would be locked in a capsule of metal hurling himself through space towards Proxima I. He was looking forward to ten days cooped up in a spacecraft of the type furnished by the Bureau of Astrogation to its engineers which was a far cry from the sumptuous craft run by the Big Brass. His confines would be lined with functional scientific equipment; his air supply would be medically acceptable but aesthetically horrible; and his vision limited to the cabin, for beyond the viewports would be only the formless, endless, abysmal blackness of absolutely nothing while the ship mounted into multiples of the speed of light. Then days in a building filled to the dome with power equipment and radio gear; timing mechanism and recorders; and a refrigerator set-up that struggled with the awesome heat poured into Proxima I by its close-by luminary but which succeeded only in lowering the temperature to the point where the potting compound in the transformers did not run out, where the calibrating resistors would not change their values, where the recording machines would still make a record. And then again more days in the ship before it returned to earth. Call it thirty days and understand why Paul Grayson sauntered along killing time in the fresh air before taking off. Paul grinned. Four years ago he had arrived a full hour early and wasted the hour in the smelly ship instead of filling his lungs with clean fresh air. Never again. He would arrive a full five minutes before check-in time. He heard some radio music, its tone stripped of high frequencies from its passage through the slit of a partially-opened window. He sniffed the air and laughed because someone was cooking corned beef and cabbage. Then he was out of the range of the radio music. Paul liked music. He hummed a tune as he walked, and then as the fancy struck him, he started to sing. It was faint singing; it would not have carried more than a few feet, but it sufficed for Paul. It was a refrain from an early atomic-age ballad: "_Round and round and round go the deuterons Round and round the magnet swings them Round and round and round go the deuterons Smack! In the target goes the ion beam!_" Paul stopped his song because the interesting click of high heels on the sidewalk pointed to the approach of someone who might view _a cappella_ singing as an indication of inebriation. She was coming towards him, walking on the same side of the sidewalk. Her step was quick and lithe, and the slight breeze outlined her frock against her body, revealing and at the same time concealing just enough to quicken the pulse and awaken the interest. Paul was thirty and unmarried, and experienced enough to catalogue her shrewdly.