In 2008, Wikipedian Mark J. noticed that, when he opened a random Wikipedia article and kept clicking on the (non-parenthesized, non-italicized) link, he always ended up on the article "Philosophy" at some point. People quickly created software to find out that this phenomenon works for about 97% of all articles.
The first sentence of an article often defines the topic of the article, and points the reader to a broader subject, eventually reaching abstract topics like Mathematics, Science, or Philosophy.
And that concludes this year's edition of the Advent Calendar of Curiosities. Thanks for reading, and have a great 2020! <3