might have something to do with the Stock market game that all students participate in around those grades in school...and since Googles stock ticker symbol is "goog" and they are very internet savy, more so than older generations who didnt have a ".us" it is not a long shot to guerss that they are instinctively typing in goog.us since it is a us stock to try to find info about googles current stock prices to make buying or selling decisions about their portfolios....just my wooden nickel...