The shell of floating quaddies hovering expectantly around him in the lecture module had been officially augmented by both the off-duty pusher crews, and loaded with all the off-shift older quaddies Silver had been able to contact covertly. Sixty or seventy altogether. The lecture module was jammed, causing Leo to jump ahead mentally and think about oxygen consumption and regeneration plans for the reconfigured Habitat. There was tension, as well as carbon dioxide, in the air. Rumors were afloat already, Leo realized, God knew in what mutant forms. It was time to replace rumors with facts.

Silver waved all-clear from the airseal doors, turning all four thumbs up and grinning at Leo, as one last T-shirted quaddie scurried within. The airseal doors slid shut, eclipsing her as she turned to take up guard duty in the corridor.

Leo took up his lecture station in the center. The center, the hub of the wheel, where stresses are most concentrated. After some initial whispering, poking, and prodding, they hushed for him to an almost frightening attentiveness. He could hear them breathing. We would need you even if you weren't an engineer, Leo, Silver had remarked. We're all too used to taking orders from people with legs.

Are you saying you need a front man? he'd asked, amused.

Is that what it's called? Her gaze upon him had been coolly pragmatic.

He was getting too old; his brain was short-circuiting to some distant rock beat, slipping back to the noisier rhythms of his adolescence. Let me be your front man, baby. Call me Leo. Call me anytime, day or night. Let me help. He eyed the closed airseal doors. Was the man waving the baton at the front of the parade pulling it after him—or being pushed along ahead of it? He had a queasy premonition he was going to learn the answer. He woofed a breath, and returned his attention to the lecture chamber.

"As some of you have already heard," Leo began, his words like pebbles in the pool of silence, "a new gravity technology has arrived from the outlying planets. It's apparently based on a variation of the Necklin field tensor equations, the same mathematics that underlie the technology we use to punch through those wrinkles in space-time we call wormholes. I haven't been able to get hold of the tech specs yet myself, but it seems it's already been developed to the marketable stage. The theoretical possibility was not, strictly speaking, new, but I for one never expected to see its practical capture in my lifetime. Evidently, neither did the people who created you quaddies.