"Good for you," Martha said. She picked up her book and started reading.

Dr. Hargrave put the gun back in his pocket and went to the door.

"Take a few days off starting tomorrow," he said before going out. "I'm going to be slowly going crazy trying to figure this mess out. That's why I insisted to Dr. Bemis that I be confined _with_ the crew of the _Endore_--just in case."

His heels made loud noises on the marble floor of the corridor. He pushed through the revolving doors to the sidewalk.

There was an argument going on between a small newsboy and an elderly gentlemen type of man.

"I tell you there's only two pennies," the boy insisted.

"There's four," the man insisted just as strongly. "See?"

He pried open the boy's fingers and looked.

"Sorry," he said. "You're right." His hand went into his pocket to make up the deficit.

"Hey! Wait a minute," the boy said. "I was wrong. You gave me two pennies too much."

A small pudgy finger took two of the pennies. The boy glanced at the others to make sure the right number were left.

Nale was close enough to see what happened. He saw the pennies taken from what seemed to be seven or eight in the boy's palm. When the two were taken away there seemed to be a slight blur--and there was only a solitary penny left.

He didn't wait. The paper boy and the customer were still patiently arguing as he climbed into his car and drove away. He drove slowly with his foot close to the brakes.

Although his eyes were warily watching each car on the street, his mind was busy. _He was trying to figure out who had been shot._

"It might even have been me!" he thought. And there was no way of knowing.

He drove the car another block. There was doubt growing in his mind. On a sudden impulse he pulled the car over to the curb and stopped the motor. Getting out, he started walking rapidly. There would be three miles of walking before he reached observation, but it would be safer to walk.

A block further he stopped abruptly in surprise. The s.p.a.ceport observation hospital was just in front of him.

"I should have guessed," he muttered as he pushed through the heavy doors. "The speedometer, of course. Naturally it would go first."

Martha Ryan saw the door close on Dr. Hargrave, then started reading again. She finished the page and turned it over. The first few words of the opposite side of the sheet showed the continuity to be difficult.

Thinking she might have turned two sheets by mistake, she turned back one. It was still wrong. She sighed exasperatedly. She distinctly remembered that she had been on page twenty-five, so the next page should be twenty-six. Since it hadn't been, she would have to look for twenty-six.

She looked through the book, page by page, and it wasn't there. Getting over her exasperation she made a game of it. Finally she developed to the stage where she would open the book at random, note the number of the page, close the book, and then try to find that page she had just seen.

It was a very peculiar book. She found that, (a) she could find any page number she wasn't looking for, and (b) any page number she looked for was not in the book, even though it had been a moment before.

Resting thoughtfully for several minutes on this achievement of deduction she decided to try another experiment. She counted the number of sheets of paper in the book and wrote the number down. It was one hundred twenty-four.

Then she counted them again. There were one hundred eighty-six. She counted them five more times, making seven times she had counted them.

She got nine different numbers of sheets in the book. She decided she couldn't get nine different numbers after counting only seven times, and counted the numbers. There were five. She closed her eyes and counted to ten rapidly, then counted them again. There were fourteen.

She held out her hands. She had seven fingers on her right hand and three on her left. She chuckled dryly and thought, "Well, anyway there are ten altogether." She counted them to be sure, and there were thirteen.

Pursing her lips stubbornly she held up two fingers and counted them.

There were two. She held them rigid and closed her eyes, counting rapidly to ten. Opening her eyes she looked cautiously at the upraised fingers. There were two.

She raised a third finger to join the other two, and there were five upraised fingers. Not only that, there were seven of them clenched. She closed her eyes and counted to ten quickly, then opened them. There were three upraised fingers. She counted the clenched ones and there were two. Relieved, she checked on the upraised fingers again--and there were seven.

She gave up in disgust. Deciding she ought to go home she stood up and started to cross to the coat tree.

The door to the corridor opened and Ren Gravenard stepped in.

"h.e.l.lo!" Martha said in surprise. "I thought you were sent to observation."

"I was," Ren said. "That's where I am now, but when there are forty of you, you can sort of get lost in the group and wind up anywhere you want to."

"Well, I'm glad you're here," Martha said dryly. "Maybe you can explain a few things."

Ren grinned crookedly.

"Suppose I do the explaining over something to eat," he said. "I almost stopped and had something on the way over here, but I wanted to wait and eat with you. Do you mind?"

"Of course not," Martha frowned. She was taking a closer look at this s.p.a.ceman second cla.s.s. He had a nice way of smiling at her. His eyes had depths she hadn't noticed before.

The illogical thought came to her that maybe now that things didn't behave the way they should, maybe he and his fellow s.p.a.cemen were the only ones that knew what it was all about.

"All this," Martha waved her hand vaguely. "It must have been caused by something about the _Endore_, mustn't it?"

Ren nodded, holding the door open for her. They walked along the corridor to the revolving doors, his hand tucked protectively under her arm.

"Is it mental?" Martha asked when they were on the sidewalk.

"No," Ren answered. "But let's wait until we eat. I'm starved to death.

If you run into any trouble I'll help you out. You see, I know how to work things."

"Like finding page twenty-six in the book I'm reading?" Martha asked.

"That's simple," Ren said. "All you have to do is look for page twenty-nine and you'll run across page twenty-six right away. Things like that are mental, partly. I mean, you have to have the right att.i.tude to get results you want."

"I don't understand," Martha said.

"Well, it's like this," Ren explained. "If you're looking for page twenty-six it won't be one of the first two pages you look at, regardless of where you open the book. But after you've looked at three of them you've pa.s.sed the page you want unless you're not looking for it. If you're not looking for it you REACH the right page."

"But why page twenty-nine to find twenty-six?" Martha persisted.

"It has to do with the new arithmetic," Ren said.

"Oh," Martha said dully. "So that's the whole trouble with everything."