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She made no comment on what had been said during the night. Instead, she began discussing a way to keep one of the organic antibiotics from splitting into simpler compounds when they tried to switch it over to Mars-normal. They were both hopelessly bad chemists and biologists, but there was no one else to do the work. Chris worked harder than ever during the day.

He squeezed some of the gravy and bits of meat into one of his bottles, sticking to his purpose; then he fell to on the rest. But after a few bites, it was queerly unsatisfactory. The seemingly unappealing Mars-normal ragout suited his current tastes better, after all. Once the steward had cleared away the dishes, Doc went to work. It was better than wasting his time in dread.

She dropped her eyes, then raised them to meet his defiantly. "I'm not just scared and selfish. Dad caught it, too, and it must be close to the time for him. He switched to Mars-normal when he was a liaison agent and never changed back. Dan, are we all going to have to die? Can't you save him?" Feldman was out of his suit and at the control panel.

They could afford it, Doc decided. He wouldn't cost them much, considering the distance he was going. "Bring me two complete dinners one Earth-normal and one Mars-normal." "Okay, Feldman. But if you think you can suicide that way, you're wrong. You may be sick, but you'll be alive when they dump you." A sharp click interrupted him. "That's enough, Steward. Captain Everts speaking. Dr.

The guards unstrapped the prisoners, and handed them pressure suits. Moments later they were in a section in crews' quarters where they stripped off their suits. This orbit-ship was much larger than Roger Hunter's; the gravity was almost Mars-normal, and it was comforting just to stretch and relax their cramped muscles. As long as they didn't think of what was ahead.

A moment later they heard the tractor start off. But Doc had no time to think of her. He and Harkness split up and began covering the streets, house by house, while he passed on the word to abandon the metabolism switch and go back to Mars-normal. Jake sent two other doctors to relieve them late in the evening. Things were somewhat quieter at GHQ as Doc reported the events at Marconi.

The cheapness of synthetics and the discovery that many diseases common to Earth would not attack Mars-normal bodies led to the wide use of synthetics on Earth. No pariah could have been expected to afford Earth-normal. Feldman finished the soup, and found a cigarette that was smokable. "Any objections if I sit in the waiting room?" He'd expected a rejection, but the counterman only shrugged.

They lost seven mice in two days, but that seemed unimportant; the females were already living up to their reputations, nearly all pregnant. Doc didn't know the gestation period, but he remembered that it was short. "Funny they all started at the same time," he commented. "Must have been shipped out separately or else been kept apart while they were switched over to Mars-normal.

Then he began packing the few things that might help. There should be no appendicitis on Mars. The bugs responsible for that shouldn't have adapted to Mars-normal. But more and more infections found ways to cross the border. Gangrene had been able to get by without change, it seemed. So far, none of the contagious infections except polio and the common cold had made the jump.

Since the synthetic foods turned out to be Mars-normal, that was probably the more natural form. Research designed to let the early colonists live off native food here had turned up an enzyme that enabled the body to handle either isomer. In a few weeks of eating Martian or synthetic food, the body adapted; without more enzyme, it lost its power to handle Earth-normal food.