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Like @celtschk says in a comment, traditional encyclopedias like Britannica have professional editors. It is their task to decide what gets an entry and what doesn't. This is different from Wikipe...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/47663 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/47663 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Like @celtschk says in a comment, traditional encyclopedias like Britannica have professional editors. It is their task to decide what gets an entry and what doesn't. This is different from Wikipedia, which is edited by anybody and everybody willing. Since traditional editors have only that many hours in a day, and there's only that many of them, more prioritising goes into picking entries in a traditional encyclopedia. For the same reason, those entries change more slowly. The price Wikipedia pays for everybody being able to add entries is that mistakes enter more easily. They can also be corrected more easily, of course.