[catch23]

the google founders were able to easily explain "PageRank" in just a few words, yet nobody considered their approach during the era of Altavista & Hotbot.

There might be a simple & obvious solution out there, but nobody has attempted it yet.

[dsplittgerber]

Yes, exactly my point. It will be a simple & obvious (with hindsight!) solution. I'm just saying that if it were possible with the current ideas floating around (not just here), it would already have been done.