If I recall, in the novel Solaris, set largely on a spaceship orbiting a distant, sentient planet, one of the characters uses a slide rule.

Idea for a sci fi novel: total reliance on chatbots that predict what you want to hear based on the average of the internet ends the astonishing run of innovation we've had since the industrial revolution, and returns us to the situation humanity has been in for most of our history, in which technology develops slowly, if at all. What do things look like in a thousand years, when we're still relying on the current equivalent of slide rules and analog film?