Everything is about philosophy, in the end — at least on Wikipedia.
If you click the first (non-italicized) term of nearly any Wikipedia entry, eventually you end up at their “Philosophy” page. True to form, Wikipedia already has an entry called “Getting to Philosophy,” which describes the phenomenon.
According to Wikipedia, the effect is true for 94.5% of all entries, and was first discovered in 2008.
WikiLoopr is an amusing little application that shows you these routes. Enter any term for which a Wikipedia article exist in the search box and press Enter. Then watch the chain of events unfold.
The path from a Wikipedia article to Philosophy takes unlikely routes, for instance, starting at India you are taken through 12 steps via subjects such as South Asia, South, Noun, Science and Reality, and finally ending at the Philosophy-Problem loop.
There have been some theories on this phenomenon, with the most prevalent being the tendency for Wikipedia pages to move up a “classification chain.”
The Wikipedia Manual of Style guidelines says that the lead section of an article should start by defining the topic of the article, so that the first link of each page will naturally take the reader into a broader subject, eventually ending in wide-reaching pages such as Mathematics, Science, Language, and eventually to Philosophy.