Is it just a popular topic getting upvoters who vote for popular items or is there something genuinely interesting about this?
You may find http://hn.algolia.com of interest to look through, to see the kinds of things HN tends to upvote, and the kind of things that tend to get passed by. Different things attract different levels of attention and fascination on here. It can actually be quite interesting to observe.
This is just a fascinating artefact of the HN hivemind collective interest, I guess.