For people like John, it can be awful to go from knowing where the danger is to having complete uncertainty over your future, not knowing if the service is going to keep you or not, not knowing what you are transitioning to, and knowing you are unprepared.
People plant their crops not knowing if the weather and the war will allow them to harvest.
The hardest time was not knowing if the tumor was cancerous and if it would kill her, she said.
But for Chukwu's pregnant wife, Janefrances, the additional screening meant six hours of waiting on Christmas Day -- not knowing if her husband was coming home.
What is the impact on the families of such patients, not knowing if their loved ones recognise them and whether the words they speak are understood or fall into a void?
Not knowing if the house would be lost or the utilities shut off could force many significant others, spouses and children to pile onto the equation with their own additional negative stress.
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Rather, with so many variables involved in qualifying for some forms of aid, and not knowing if that aid will come in the form of a student loan or a scholarship at most universities, perhaps more families will rise up to the challenge and create cool strategies to pay for college, with or without financial aid.
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After this phase, almost all women will take the offer or move on to somewhere else, not knowing they could have gotten more if they asked.
We've seen this, where oftentimes, the wireless community can get up and be operational, but if you evacuate and you forget your chargers and your phone dies, or if you're without power not knowing how to charge things.
And the NBA should never sign on to something before knowing it if is true or not.
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But that was superseded by not knowing what had happened and what could potentially happen if this happened again.
The defending Eastern Conference champions came into the game knowing that if they lost in regulation, they would not make the playoffs.
Even if businesses do not like the rules that govern their behavior, knowing those rules with certainty gives them something to plan around and navigate through.
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Though some may find the jostling announcements confusing, many may appreciate knowing the full range of what is coming, even if they do not know when they can expect their desired devices.
What if a social network evolved around neighbors - people who feel a certain guilt about not knowing each other better?
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"This gentleman was just about to go out as a single if you want to play some golf, " Tom said to the movie star, not knowing I was a devoted fan of the seminal blaxploitation series.
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As if to prove the woes of collaboration using existing e-mail, the three showed up not knowing which of the 15 e-mailed versions of the presentation was the right one.
She said if he had the opportunity to plant anything, he would have been foolish to try, not knowing whether there were eyewitnesses to the crime or whether Simpson had an alibi.
"The anxiety is just not knowing -- so being able to check the inbox and see what's going on, if anything, is what allows me to relax, " says Daly, 39, a self-employed technology consultant in Cincinnati, Ohio.
Mr Winwood, a retired engineer, says it is also worrying not knowing whether it could be the actual movement of the bridge that had caused the problem, or if it was down to bad workmanship or using the wrong materials.
Even if the Trakdot protected bag does not reach the desired destination, passengers will still have the reassurance of knowing which city their luggage is in.
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And if you can imagine laying on your back, in pain, tubes coming out of you, not knowing what the future's going to hold for you, whether you're going to be around or not be around, you look for an idyllic place to be, just in case.
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