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He remembers all the realms
(ttrpg.network)
Ed Greenwood's YT channel did more for me to appreciate Forgotten Realms as a setting than any book WotC put out, and he constantly revisits areas WotC has no interest in, like Sembia or Cormyr or Daelands.
I also didn't know he had a youtube channel and I don't think I've looked at a picture of him since the 90s. I had NO idea the dude had literally turned into Elminster.