I have a hard time saying "I dont know" its more of "Ill try and dig up the source" otherwise i wouldn't have said it either way.  There must be a reason that a conclusion was came to.    Yeah i love that George Carlin quote - "If You Want To Tell People the Truth, You’d Better Make Them Laugh or They’ll Kill You"  The thing is one fact doesn't necessarily lead them to research others. I think that may be the main problem.  The inquiry doesn't go further than the conversation at hand.