Shellerz is right. It was a uman mistake. The webistes are uploading everyday and someone made a mistake while doing so. Google was working badly only for one hour and that's it. Such situation shows how giant on the market Google is - Google doesn't work corrextly and everyone thinks that the internet is not working correctly!
it seem they checking on their new algo, for semantic search. written a s small blog busini.wordpress.com on more possible reasons.