But chemists are scrambling to turn the proof of concept into a working piece of electronics.
The proof of that is that 50 percent of college graduates this year can't find work.
This is the proof of a better future for children and adults struggling with this disease.
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The proof of its efficacy will be months away in data that track jobs, inflation and consumption.
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"The proof of the pudding will be in the eating, in regard to these changes, " she said.
You can't be convinced of the absolute proof of the working at a 100% level of any technology.
The proof of the pudding comes from people that have engaged with the person or business in question.
Some companies pointed out the need to start thinking beyond the proof of concept or pilot project strategy.
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The proof of this condition was that they piled up, remorselessly, in garages and basements, to be read .
And I would argue the proof of that for the UK has been what has happened in capital markets.
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As with anything else, the proof of the pudding is in the eating.
The documentation is in place but the proof of whether it is all genuine will be if it turns up.
The proof of how successful LinkedIn has been is readily apparent.
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As a result, "there's a tremendous amount of discretion, but that discretion is really limited to the proof of the child's actual lifestyle needs, " he said.
While the sheriff's men miss the proof of her guilt, their more perceptive wives immediately spot what has actually been going on in the bleak farmhouse.
Yet the mayor realises where the proof of the pudding lies: whether middle-class parents en masse will feel happy to send their children to inner-city schools.
The proof of concept design was initially created some time ago, and sponsors of the project have helped build the hardware according to the students' original designs.
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But the proof of the pudding comes in the tasting - and the French have already given it a food award at the Paris International Food Salon.
The proof of this contention is that Lieberman himself has such deep loyalty to the party that if he loses, he intends to run as an independent.
Of 34 pet dogs on the proof of concept trial, 23 had the cells transplanted into the injury site - the rest were injected with a neutral fluid.
"About half of the blueberries we picked made it into the can, the other half we ate, blue fingers and tongues the proof of our work, " she says.
And I think you saw and have seen in the reaction of the people of Boston and in the reaction of Americans across the country the proof of that statement.
That liability usually ends up as Treasury debt parked at the Federal Reserve in custody for foreign governments, the proof of purchase for billions of dollars in extra U.S. imports.
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But the proof of whether a car company is successful comes in two fundamental ways: is it getting people to buy its cars, and is it making money doing so?
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Despite several regrettable accidents, the proof of the promise of tiltrotor technology is in hand thanks to thousands of developmental flight hours that have satisfied or exceeded every requirement.
David Handley, from Farmers For Action, described the meeting as positive, but added "the proof of the pudding will be when they deliver a sustainable milk price to dairy farmers".
Despite several regrettable accidents, the proof of the promise of tiltrotor technology is in hand -- thanks to thousands of developmental flight hours that have satisfied or exceeded every requirement.
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