The Missing Disclaimer

This situation was becoming complicated. K-17 thought over all the possibilities. Was it possible that this magazine contained only Fiction? The title of the thing was Atomic Science Stories. He remembered that he had read a similar magazine called Impossible Science Fiction. Was the distinction between "stories" and "fiction" significant? A fiction was obviously false; but a story could be any narrative, true or not. Did this mean—? Good Vog, he wished he knew more about Earth culture. But that was what he was here to find out. They knew nothing, absolutely nothing, about Earth people. And they didn't want to try to kill the inhabitants and take over the planet without knowing more about them.