Few days ago, when this was on MainPage, it ended in different loop than now. Today most articles ends in cycle between Philosophy and Modern Philosophy.. ( http://en.wikipedia.org/wiki/Modern_philosophy ) few days ago, it was cycling between Philosophy and Agency ( http://en.wikipedia.org/wiki/Agency_(philosophy) ) What changed and why?
Aha, someone changed the first link on page Problem from purpose to obstacle.
Its a little bit like butterfly effect :)