There were two possible explanations for it all. One was that the aliens still lived here and for some reason had come to his aid. The other was that he stood in a place where robot machinery worked, though those who had set it up were no longer there. It was difficult to separate his memory of the half-buried globe he had seen from his sickness of that moment. Yet he knew that he had climbed and crawled through emptiness, neither seeing nor hearing any other life. Now Ross restlessly paced up and down, seeking the door through which he must have come, but there was not even a line to betray such an opening.
1.Again Ross leaned against the rock, studying the length of beach. Had he been wrong in thinking that they were within the range of his voice? The power they had used might carry over a greater distance.
2."Any discovery in science comes about by steps. It can be traced back through those steps by another scientist. But suppose you were confronted by a result which apparently had been produced without any preliminaries. What would be your guess concerning it?"