"These cancel the positron--and that process produces hard gamma rays again--of the same energy content as required to cause the 'pair production' in the first place. About one million electron volts plus," he added. She hesitated a moment. "Now--about this negative mass," she said. "Simple," he said. "Very simple. A negative mass is the only thing that can exceed the speed of light. Similarly negative energy is the only kind that can propagate in excess of light. So now let's juggle equations until we can reproduce the same." Rhine nodded, picked up a pencil and then looked at him expectantly. "Put down," he said with a smile, "the first equation that ever told the truth about the relationship between mass and energy. Energy 'E' equals Mass 'M' times the squared speed of light, 'C^2'." "And from there?" "And from there we start juggling until we find out how to introduce the negative factor. And I do not mean by dividing by the square root of minus one," he told her. * * * * * Doctor Pollard looked up at the man who stood before his desk. "Mr. Galloway," he said, "You may believe yourself normally right but you are ethically wrong." "Morals and ethics be hanged!" snarled Rhine's brother. "That nut has kidnaped my sister again." "Not without her aid," smiled Pollard. "Aid be hanged too!" shouted Kingston Galloway. "He tried to kill her once and he may try again." "Look," said Pollard quietly. "There are times when personality and identity mean nothing. I think well of my life, as much as you think of yours. Yet I'd feel less than human if I permitted myself and my ideas to stand in the way of civilization." "Stop talking like a superior being and come down to facts," yelled Kingston Galloway. "I am. James Forrest Carroll is the only man on earth who can save Terra from certain destruction. Your sister can be of help to him." "How?" demanded Kingston. "Rita is an excellent librarian. She has the ability to recall facts and figures beyond most people. She has almost an eidetic memory. Whether Carroll is sane or completely schizophrenic-paranoid, his statements and his theories are solid when based upon his own line of reason. "That his line of reason does not agree with heretofore known physical facts is of no consequence since several of the unsound, unscientific, un-factual reasonings have produced things that work. Unsound as they may seem, they are not unreasonable--excepting to us who can not reason that way." "Get to the point." "Whether Carroll urges Rita to display a horde of facts because he thinks they come from an alien mind in a human body, or whether he understands the truth--that they are merely repeats of his own statements made when he does not recall them--the fact remains that Rita is his tabulator, his encyclopedia of fact, his memory. She and she alone can put down concurrently things he has reasoned out, once when himself and next when he is--un-sane."