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Was in a freefall. today we still dont know actually what triggered it and that is fueling some real concerns as the markets opened up this morning. investors concerned about what is happening in greece and whether or not the u.s. could be exposed. the u.s. economics editor for the economist and john harwood is cnbcs chief washington correspondent. john, let me start with you. we were all kind of in it together in those frightening moments where the dow really fell off a cliff. we dont know this...