"Forty-two-five nutrient. It has everything needed to sustain the average seventy-kilogram man for eighteen hours."

Hall drank the liquid, which was syrupy and artificially flavored to taste like orange juice. It was a strange sensation, drinking brown orange juice, but not bad after the initial shock. Leavitt explained that it had been developed for the astronauts, and that it contained everything except air-soluble vitamins.

"For that, you need this pill," he said.

Hall swallowed the pill, then got himself a cup of coffee from a dispenser in the corner. "Any sugar?"

Leavitt shook his head. "No sugar anywhere here. Nothing that might provide a bacterial growth medium. From now on, we're all on high-protein diets. We'll make all the sugar we need from the protein breakdown. But we won't be getting any sugar into the gut. Quite the opposite."

He reached into his pocket.

"Oh, no."

"Yes," Leavitt said. He gave him a small capsule, sealed in aluminum foil.

"No," Hall said.

"Everyone else has them. Broad-spectrum. Stop by your room and insert it before you go into the final decontamination procedures."

"I don't mind dunking myself in all those foul baths," Hall said. "I don't mind being irradiated. But I'll be goddammed—"

"The idea," Leavitt said, "is that you be as nearly sterile as possible on Level V. We have sterilized your skin and mucous membranes of the respiratory tract as best we can. But we haven't done a thing about the GI tract yet."

"Yes," Hall said, "but suppositories?"

"You'll get used to it. We're all taking them for the first four days. Not, of course, that they'll do any good," he said, with the familiar wry, pessimistic look on his face. He stood. "Let's go to the conference room. Stone wants to talk about Karp."

"Who?"

"Rudolph Karp."

Rudolph Karp was a Hungarian-born biochemist who came to the United States from England in 1951. He obtained a position at the University of Michigan and worked steadily and quietly for five years. Then, at the suggestion of colleagues at the Ann Arbor observatory, Karp began to investigate meteorites with the intent of determining whether they harbored life, or showed evidence of having done so in the past. He took the proposal quite seriously and worked with diligence, writing no papers on the subject until the early 1960's, when Calvin and Vaughn and Nagy and others were writing explosive papers on similar subjects.

The arguments and counter-arguments were complex, but boiled down to a simple substrate: whenever a worker would announce that he had found a fossil, or a proteinaceous hydrocarbon, or other indication of life within a meteorite, the critics would claim sloppy lab technique and contamination with earth-origin matter and organisms.

Karp, with his careful, slow techniques, was determined to end the arguments once and for all. He announced that he had taken great pains to avoid contamination: each meteorite he examined had been washed in twelve solutions, including peroxide, iodine, hypertonic saline and dilute acids. It was then exposed to intense ultraviolet light for a period of two days. Finally, it was submerged in a germicidal solution and placed in a germ-free, sterile isolation chamber; further work was done within the chamber.