Comment by Kronopath

I think that website cheats a little bit. The first link in "Science" is not "Knowledge" but "Latin", where it's describing the root of the word "Science". If you follow it properly, you'll find that even the article for "5 Whys" doesn't go to Philosophy:

  5 Whys
  Technique
  Technology
  Tool
  Goal
  Animal
  Eukaryote
  Organism
  Biology
  Natural Science
  Science
  Latin
  Italic Languages
  Indo-European Languages
  Language Family
  Language
  Human
  Taxonomy
  Ancient Greek
  Greek Language
  Indo-European Languages // Infinite loop!