The need for the parts of an engine to fit together tightly enough to stop hot gases seeping where they should not, and yet not so tightly that they rub on each other in a way that wears them out, is a constant bane of engine designers.
Barnes and Noble has struck a successful balance between having enough books to make the customer feel he has sufficient choice, and yet not so many as to make him feel overwhelmed.
We do not fully understand Al Qaeda and its relationship to supportive communities in the Islamic world, and so are not yet able to develop an effective strategy for countering its propaganda in those communities, let alone for winning the information campaign in the war against terrorism.
But it's the feeling that occurs before the end, when it's taut and undecided and not yet cruel, which makes games so addictive and worthwhile.
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But while technology for accessible kiosks exists, the kiosks themselves have not been manufactured and are not yet available in the marketplace, so providing them will be a much greater challenge.
And yet I am not so won over by Bogle's thinking that I subscribe to the efficient market hypothesis.
More shocking still is that we as human beings have the power to stop torture and yet we have not done so.
It is not yet mandatory and so far no team has committed to using it in the race in Melbourne on 29 March.
But America's growth prospects are not so poor and the subprime-mortgage market not so woeful at least, not yet that they can fully explain the dollar's recent sickliness.
However, it has not yet become so and in that breathing space the global authorities, the EU and the Greek political elite do have the space to do some form of controlled default, as the IMF believed Argentina should have done.
Eating such products meant you were guilty of being a dietary Neanderthal, deliberately harming your health and violating the health ethos that so many Manhattanites profess to possess, and yet to judge by looking at pedestrians, not so many practice.
Mr. ALAN STERN (Southwest Research Institute): And, you know, whereas we know of four terrestrial planets and four gas giants, we expect that there are hundreds if not thousands of these ice dwarfs, and so this class of planets which we have not yet reconnoitered is in reality the most populous class of planetary body in our solar system.
And indeed, while the symptoms are not yet so severe, America is moving in the same direction.
One official said the United States had limited information so far and could not yet confirm those are the specific warplanes that conducted a strike.
But he has not done so yet, and his henchmen are hinting that the consequence of an adverse judgment will be a state of emergency.
Mr. WESSEL: We have broken almost every rule and guideline and precedent so far in this crisis, and it's not over yet.
And he had shown me an Aztec poem, and Aztec poetry is all about this conflict that the heart goes through because of loving life and finding life so beautiful and yet knowing that we are - that we are not immortal.
But experience shows that the market mechanisms, or the people using and building them, are not so sophisticated, yet.
Also, the safe and effective levels of drugs such as sibrafiban are not yet known, and the patients included in the study may not have been high risk, so the drug's effect would be small, they added.
The tiny Massachusetts island is compact enough so that visitors do not need a car and most arrive without one, yet it creates the illusion of being much bigger since so much is preserved as protected natural space.
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The Lord Mayor of Armagh, Sharon Haughey, lives in and represents one of the so-called 'not spots' and she said people do get frustrated when they see yet more investment in Belfast.
Whether this means an increase in other channels such as email, mobile, radio, and so on, is obviously not known, yet.
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It's attracted a commitment from T-Mobile in the US (timeframe not yet specified) and other carriers around the world, so we're likely going to see a lot more of this little beaut in the future.
"I wanted to go to North Korea and because it was not yet mapped I decided to start mapping so I could at least see how easy it would be to travel within the country, " Sebastiaan van Oyen, who works as a risk manager for a financial trading firm in Sydney, told the BBC.
Yet current casting is not so monolithic, and it varies from cable to network, from sick-joke satire to earnest heart-tugger.
It looked just like a normal watch in its photo and was not the first watch made in ceramic, yet it was so highly requested.
Nevertheless, the record gives yet more reason for bigger funds to seek to avoid fledgling companies especially those that have not yet put together a complete team of managers and so require extra attention.
These standards do not apply to tablets or phones as yet: so iPad and iPhone sales will be entirely unaffected.
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The standards commissioner also expressed his frustration that the "full facts and analysis" in his report to the standards committee had not yet been published so that people could understand how he had reached his conclusions.
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