"But you said Les Ro wanted to see me, that he had waited a long time for someone like me. Though how he knows anything about me--" Ronson's voice went into uneasy silence. Had the grapevine reported his coming here? Or had Crick's whisper about extra-sensory perception in operation had some basis in fact? "I said Les Ro waited a long time for someone _like_ you." For a moment hope showed on the wrinkled face. "But not necessarily for you. You have certain qualities that Les Ro seeks, but until you have proved that you have other qualities as well--" Sadness replaced the hope. "Tell me what you seek here?" Ronson felt rebellion come up in him. Then he remembered that on Mars the only law protecting humans was what they could make and enforce for themselves. "Rumors have reached us on Earth of Les Ro's great accomplishments. It is our hope that we can share our knowledge, pool our discoveries. It is our belief that great advances can come from this sharing--for both humans and Martians." Ronson spoke quietly. Only the tone of his voice expressed the very deep and very real feeling he was putting into words. Yet in the quietly spoken words his dream was expressed--and the dream of every real scientist in the history of Earth--of progress, of forward motion, of leaving behind them a world a little better than the one they had known. Once this dream had been only for humans. Now it included Martians too, and every other race within the solar system. The Messenger smiled at the words. But under the smile was concern. "Do you mean that you humans still face problems that you cannot solve? But you have made tremendous scientific advances, much greater than we of Mars have made. Space flight is only one illustration--" "Unfortunately, many of our scientific advances have brought more problems than they have solved." Grimness crept into Ronson's voice "Before atomic energy was released, it was prophesied that the release of this energy would solve all the problems of our planet. This was over two hundred years ago. We are still striving to regain the losses suffered in the first and second atomic wars." "Wars?" The face of the Martian showed amazement. "You humans are fools." "We are trying to stop being fools. Or some of us are. But something seems to defeat our efforts." "Yes." Keen interest showed on the face of the Martian. "Do you have this problem too? I wonder if it's the same something--" "We live in the same universe." "Can you state the problem more exactly?" "I can give you an illustration of it. At the same time, I will give you my reason for being here." Ronson took a deep breath, considered the words he was going to use. "I'm a bio-physicist. This means that my specialty is the living cell and the changes that can and do take place in it. We have a name for one of the changes that may take place there--cancer." "A disease."