Winning War Through Artificial Selection

"The project was cancelled," said Nessus. "We found that the Man-Kzin wars put sufficient restriction on kzinti expansion, made you less dangerous. We continued to watch. "Six times over several centuries, you attacked the worlds of men. Six times you were defeated, having lost approximately two-thirds of your male population in each war. Need I comment on the level of intelligence displayed? No? In any case, you were never in real danger of extermination. Your nonsentient females were lar...

 Teleporters Homogenize the World

In Munich he walked. The air was warm and clean; it cleared some of the fumes from his head. He walked the brightly lighted slidewalks, adding his own pace to their ten-miles-per-hour speed. It occurred to him then that every city in the world had slidewalks, and that they all moved at ten miles per hour. The thought was intolerable. Not new; just intolerable. Louis Wu saw how thoroughly Munich resembled Cairo and Resht ... and San Francisco and Topeka and London and Amsterdam. The st...