So they floated in a non-rotating space, while the curved roof of the tank rotated over them at its usual four rpm. It was a peculiar sight, which along with the weightlessness made some people begin to look thoughtful in a pre-seasick kind of way. These unfortunates congregated down at the end of the shelter where the lavatories were located, and to help them out visually, everyone else oriented themselves to the floor. The radiation was therefore coming up through their feet. Maya felt an impulse to keep her knees together. People floated in place, or put on velcro slippers to walk over the floor. They talked in low voices, instinctively finding their next-door neighbors, their working partners, their friends. Conversations were subdued, as if a cocktail party had been told that the hors d'oevres had been tainted.

John Boone rip-ripped his way to the computer terminals at the fore end of the room, where Arkady and Alex were monitoring the ship. He punched in a command, and the radiation data were suddenly displayed on the room's biggest screen. "Let's see how much we're getting cooked," he said brightly.

Groans. "Must we?" exclaimed Ursula.

"We might as well know," John said. "And I want to see how well this shelter works. The one on the Rust Eagle was about as strong as the bib you wear at the dentist's."

Maya smiled. It was a reminder, rare from John, that he had been exposed to much more radiation than any of the rest of them-about a hundred and sixty rem, as he explained now in response to someone's question. On Earth one caught a fifth of a roentgen equivalent man per year; orbiting Earth, still inside the protection of the Earth's magnetosphere, one took around thirty-five per year. So John had taken a lot of heat. And somehow that gave him the right, now, to screen the data if he wanted to.

Those who were interested-about sixty people-clumped behind him to watch the screen. The rest relocated at the far end of the tank with the people worrying about motion sickness, a group that definitely didn't want to know how much radiation they were taking. Just the thought was enough to send some of them into the heads.

Then the full force of the flare struck. The radiation count shifted to well above the solar wind's usual level, and then soared in a sudden rush. An indrawn hiss came from several observers at once, and there were some shocked exclamations.

"But look how much the shelter is stopping," John said.

He pointed to another number, changing as rapidly as the first, but on a lower trajectory; it rose to a high of 8.79 rem per hour. Several lifetimes of dentists' X-rays, to be sure; but the radiation outside the storm shelter would have been a lethal dose, so they were getting off lightly. Still, the amount flying through the rest of the ship! Billions of particles were penetrating the ship and colliding with the atoms of water and metal they were huddled behind; hundreds of millions were flying between these atoms and then through the atoms of their bodies, touching nothing, as if they were no more than ghosts. Still, thousands were striking atoms of flesh and bone. Most of those collisions were harmless; but in all those thousands, there were in all probability one or two (or three?) in which a chromosome strand was taking a hit, and kinking in the wrong way: and there it was. Tumor initiation, begun with just that typo in the book of the self. And years later, unless the victim's DNA luckily repaired itself, the tumor promotion that was a more or less unavoidable part of living would have its effect, and there would appear a bloom of Something Else inside: cancer. Leukemia, most likely; and, most likely, death.