I had to use Prolog in a Programming Languages course in college. I never knew something like it existed. It's actually Turing complete and people have made weirdly complex things with it, such as a text editor. But otherwise, it's basically a database/logic querying system?
All I remember is a fun fact, that in the 90s (80s?) there was a research effort in Japan called the Fifth Generation Computer Project to create a proper advanced OS similar to supercomputers with builtin AI (?) and they used Prolog. After hundreds of millions of dollars and years of intense effort, they just gave up. Everyone else just used C and then we got Windows.
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