The truth is that neither the U.S. intelligence community, nor the International Atomic Energy Agency, nor anybody else outside a very small circle in Iran has certain knowledge about the current state of Irans nuclear-weapons program, or how far it is from producing one or more usable devices.
One reason why the Cypriot bailout debacle matters - perhaps the main reason - is that it shows how far the eurozone is from the kind of solidarity which many believe essential to the currency union's long-term survival.
That is far from how the administration presents it, however.
It is also emblematic of how far the rest of Congress is from understanding how quickly the biotech revolution will be upon us and how dramatically it will impact all facets of our world.
Moreover, even today it is far from clear how the Dodd-Frank bill will work in practice.
But much has changed since 1994, and it is far from certain how the issue will play in this year's presidential election.
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It tells you how far the company is from cashflow breakeven, and hence gives an indication of how much money will be needed to get there.
It is far from clear how this plays politically.
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Things should improve next year, says Christine Whitehead of the London School of Economics, as new contracts have been signed, but it is far from certain how many homes will be built.
It is unclear from the Reuters report how far-ranging the discussions between Apple and Google are at this point.
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It is a sign of how far Mr Blair has fallen from grace that the man who runs the NCTC, Michael Leiter, should be among those mentioned as a successor.
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Estimating how much it will cost to convert to the euro is far from easy.
It is a measure of how far the immigration debate has moved from head to gut that Mr Tancredo is now in many ways mainstream (and his immigration caucus has 92 members).
Yet Mr Abiru says considerable doubt still hangs over an LNG accord with Russia, not least because it is not clear how expensive gas from the Russian Far East will be.
From the information given so far, it is not clear how many barrels of oil are expected to be produced.
The food deliveries arrive at your kitchen and you won't know where it's come from, how far its traveled, who the supplier is, what relationship they have with the grower and so on.
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