Yesterday’s comic at XKCD includes an interesting bit of Wikipedia trivia: “if you take any article, click on the first link in the article text not in parentheses or italics, and then repeat, you will eventually end up at "Philosophy"”.

I tried a few random Wikipedia articles (a random link from the Wikipedia front page, cucumber and Georgia) and it worked in all cases. The tendency became obvious after just a few hops: we skirted linguistics, science, then information, and via quantity on to philosophy.

From philosophy it’s six hops back around to science and you can go another round. The full loop is Science > Knowledge > Fact > Information > Sequence > Mathematics > Quantity > Property_(philosophy) > Modern_philosophy > Philosophy > Existence > Sense > Organism > Biology > Natural_science > Science. So you could equally well argue that all Wikipedia queries have their root in Existence, or in Knowledge, or in Information. Whatever you think is the most fundamental of all – take your pick.

Now some developer has actually made a tool for you to try this on your own: xkcd wikipedia steps to philosophy.