"You'll die."

"I'll prove a point," said Dave. "And I won't die! I'll prove to you that anybody but a top scientist can tinker all day with that thing without danger. If you think I'm wrong, remember that I was there once and came back. Now—what do I do?"

Howes laughed bitterly. "If that were as simple as winding an alarm clock or grinding the valves on a gas engine, we'd have no problem, Dave."

"You can tell me the motions; you can tell me what to do. You can coach me at the job, and with training—hell, fellers, you don't have to know organic chemistry to mix a cake and men have performed operations with a jackknife at sea, with directions by radio. I'm checked out in a B-108, and any man who can keep his eyes on seventy meters, a hundred and twelve switches, forty levers, sixty-seven pushbuttons, and drive the damned thing with his free hand at the same time ought to be able to learn whatever this job requires." He looked around him. "And in the meantime, we'll let that crystal sit there and simmer, waiting for a nice, ripe physicist to come and get stuck!"

"It will take days," said Jane thoughtfully.

"Better days than lives," said Dave sharply.

"Okay," said DeLieb. "You certainly can do no harm. You may do some good. We'll try it your way."

For the next ninety-six hours, Dave Crandall got a total of nine hours of sleep. He worked in another replica of the remote lab, using similar instruments. He had not the foggiest notion of what he was doing, but he learned the manual dexterity necessary to do it. He didn't know what the meters meant, but he learned how to read them. He couldn't understand why he must do thus and so when such and such a meter read to a certain value, but he learned that, too. He became a trained human primate, an animal who knew that four raps plus four raps equalled eight raps; a chimpanzee trained to drive an automobile.