Those articles almost always contain a well thought out or unique description of the algorithm or topic being written about. Often there will be an inline demo

Those articles almost always contain a well thought out or unique description of the algorithm or topic being written about. Often there will be an inline demo with visualization. Your response comes across as a survival bias, as I would relate the HN highly voted articles to the good recipe sites. What about the myriad of articles written on those topics that don't end up on HN which are often the copy-and-paste content of another site (eg from Wikipedia)?