Machine that Saved the World

In 1952, when computers were still room-sized fantasies, Murray Leinster imagined a world where machines could learn. Staff Sergeant Bellews works at a secret military base where ordinary appliances, vacuum cleaners, lawnmowers, are being transformed by an experimental process that lets them gather experience and improve at their jobs, becoming error-free over time. Then the broadcasts arrive: mysterious signals from space that obliterate every transmitter they touch. As chaos spreads and Earth's communications crumble, Bellews discovers the broadcasts are targeting something far more specific than human technology. They're after his machines. This isn't just an alien invasion story, it's one of the first works of fiction to seriously explore machine intelligence, self-improvement, and what happens when the tools we create start thinking back.