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Jan 5, 2021 at 14:09 comment added barbecue @PeterCordes In popular culture, extensive knowledge is generally taken as a sign of intelligence, even though it may not be.
Jan 5, 2021 at 5:52 comment added Peter Cordes Also, "brainiac" has connotations of general intelligence / problem-solving / thinking skills, moreso than knowledge. Often you need knowledge to be able to apply intelligence to a problem, and clever people often will have such knowledge in some areas, but that's not the part "brainiac" focuses on.
Jan 5, 2021 at 5:49 comment added Peter Cordes Brainiac works for smart / knowledgeable in general, but just for the record, it doesn't work well if you want to limit the meaning to a specific subject matter. e.g. "Gerald is a calculus brainiac" doesn't sound good to my ear, and you certainly wouldn't say "Gerald is a brainiac at calculus". Comparing other answers, "calculus guru" or "calculus wizard" do work very well. That's not a problem with this answer, just a usage note to help future readers know what contexts they can use each one in.
Jan 5, 2021 at 5:17 history edited barbecue CC BY-SA 4.0
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Jan 5, 2021 at 5:11 history answered barbecue CC BY-SA 4.0