Because the submitter found it interesting. From the guidelines (https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/newsguidelines.ht

Because the submitter found it interesting. From the guidelines (https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/newsguidelines.html): What to Submit On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity. Wikipedia articles are not uncommon: https://news.ycombinator.com/from?site=wikipedia.org https://news.ycombinator.com/from?site=wikipedia.org