The Creature from Cleveland Depths by Fritz Leiber, Science Fiction, Fantasy, Short Stories

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Set in a dystopian future where most people live underground due to constant missile threats, the story follows George Gusterson, an unconventional writer who prefers the surface. He invents a device called the Tickler, initially a simple gadget that evolves into a powerful tool that influences thoughts and decisions, whispering commands into the user's ear. Weighing 28 pounds, it promotes positivity but ultimately enforces obedience. As Gusterson grapples with its control, he must confront the implications of his creation before it's too late.