In life there are some certainties, some things that are less sure and others that fall somewhere in the middle.
Such meandering was captured in a volley of linguistic chaos by ex-US defence secretary Donald Rumsfeld in 2002 when he was making the case for the invasion of Iraq.
And so to our TripAdvisor Connect scoop on Tuesday, here are some of the things we know, few of the things we think and some complete guesses.
Read full story at: http://www.tnooz.com/2013/07/12/news/tripadvisor-connect-known-knowns-known-unknowns-and-unknown-unknowns/