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Comment by tokenadult | Hacker News Reader

I confess I am ignorant about how this second submission of an article recently discussed here[1] got through the duplicate submission filter. I do enjoy the article, as it illustrates a point I have often observed as a teacher: learners don't start out with blank slates in their minds, but often have all kinds of preexisting misconceptions that have to be actively undone in any educational process.

[1] https://news.ycombinator.com/item?id=10856554

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I found the reason, I found the article on LinkedIn, if you compare both links you'll see that mine is different because linkedIn added some stuff at the end of the url.

Of course, but that doesn't make checking before submitting difficult at all: bottom search box, enter a relevant keyword (e.g. "ignorance"), then sort by date. You'd see that it was posted twice before with the first getting 104 comments.

  linkedIn added some stuff at the end of the url

Yes, many sites (e.g. medium, signalvnoise) add phony fragment identifiers to URLs now; I can't think of a reason to do so other than to evade dupe detection.

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