Nor is it certain that the asbestos substitutes now used in the West are safe.
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Nor is it certain that the new entrants will ever be able to wrest away the big three hardware makers' customers.
But if the coalition does not endure for five years, neither is it certain to implode as quickly as Labour might hope.
Nor is it certain just what the short-term relief will look like.
The company has no good idea what the price of copper will be in 20 years, nor is it certain what is the probability of different possible prices.
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Whatever road Bertelsmann chooses, it says there is no hurry - it is certain it will get there by its self-imposed deadline.
It is thought that the UK operation will be put on hold for several weeks while the British Geological Survey considers the situation, but given the potential importance of fracking as a substantial contribution to world future energy needs, it is almost certain that it will not be abandoned.
It is time for another disruptive product and it is certain that Steve Jobs left that playbook for Apple.
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Of course it is not certain that a mini housing boom, if it materialises (not certain) would revive retail spending in the supposedly desirable way: although households have been saving more since the crash, they remain burdened by near-record debts.
According to these findings, the potential for success, as opposed to actual success, is more interesting because it is less certain.
No witness list has been issued nor is it even certain whether Mr Gabriele and Mr Sciarpelletti will be present in person for the opening of their trial.
If IBM is serious about this business, it is almost certain to make a run at an Amazon-type model sometime soon.
If that happens, and it is far from certain, it could help fulfil the promise of universality made in the early 1960s at the Second Vatican Council, but which Pope John XXIII did not live to nurse to maturity.
By the same token, the state will only enforce its laws without prejudice when it is certain that the public will rally behind it.
Is it just in Nairobi, or is it concentrated in certain areas?
While there is limited oversight of brokerages by the SEC, it is certain that investor protection could be significantly enhanced through ending self-regulation of this industry.
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Moreover, it is not certain that the jury would have acquitted the firm if it had received the correct instructions from the judge.
In the coming days, it is almost certain that more will be learned about the explosions and the motives behind it.
Steady eye contact is the de facto expression of openness in our culture, while avoiding it is a certain sign of discomfort.
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Due to that attrition it is virtually certain that there are more people not playing Warcraft now who have played it than are currently playing.
So while it is not certain that the Dutch team had created a deadly human strain of bird flu, it seems to be a real possibility.
There is also a chance that BP will end up not paying dividends this year and it is almost certain that the amount BP is having to pay out for the clean-up in the US will eventually affect the dividend.
But it is not certain whether her proposal will get the required two-thirds majority in Parliament to make it law.
More than 10 years ago, researchers at Massachusetts General Hospital in Boston and other centers discovered the compound aminolevulinic acid, or ALA, is a photosensitizer, meaning it is activated by certain wavelengths of light.
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Whatever the man pictured in the photo is doing, it seems certain that what he is doing to us in implanting a desire, for those of us who have yet to visit Brazil, to take a trip at the next opportunity.
The only thing the government is saying for certain is that it will not postpone the ceremony, scheduled for Thursday.
However, while this worked well in different types of mice, it is by no means certain that it would happen in humans.
While it is far from certain the drugs will help cancer patients, the new concept is generating interest because it would represent a completely new type of therapy that works in a very different way from existing drug classes.
While it is indisputable that stocks have beaten bonds in total return over the past century, it is far from certain that they will continue to do so over, say, the next 20 years.
What is clear is the requirement now is not just for more revenue, it is for a certain measure of austerity and fiscal discipline.
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