It is impractical to sue a million teenagers one at a time, each nameless and hard to trace.
In part, that is because it is impractical to distribute a full plane's worth of tablets on wide-body jets with hundreds of passengers, they say.
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Lepor thinks it is impractical to suggest that a primary care physician who has 15 to 20 minutes to spend with a patient fully explain all the pros and cons of screening in the course of an annual physical.
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Defenders of the status quo argue that it is impractical to limit the growth of spending because of entitlement programs such as Medicare and Social Security, for which spending is steadily rising due to the increase in the elderly population.
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But in today's YouTube culture, where everything from reality TV to a MySpace page can launch a career, it is no longer entirely impractical to think that fame and celebrity is attainable.
That seems like a good idea since keeping gold in your basement is risky, keeping it in your safe deposit box is impractical, and owning the metal makes it more complicated to sell.
In any case, it is impractical for most individual investors to make all these trades.
Lionel Zetter, former chairman of the chartered institute of public relations, argues it is "impractical" for lobbyists to record every meeting with civil servants and MPs.
But when you begin to dig into it, for a country as large and spread out as the United States, it is a fiendishly expensive and wildly impractical project to undertake.
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Lee, chair of the American College of Radiology Breast Imaging Communications Committee, said straightforward guidelines for screening mammography are necessary because leaving it up to a woman and her doctor is impractical.
While it was impractical to address the allegations during the campaign, it is at least possible to carry out a vote-by-vote recount to clear some of the doubts.
"This is the week that they say there has to be some progress and I'm hopeful that we can make progress, but I have to say that it is imperative that Republicans get off this extraordinarily impractical and unsuppportable demand for tax breaks, " the South Dakota Democrat said.
But video is impractical in continuous-action sports like football, where officials must stop play to use it.
You have to find things they want to do, because the more you try to get reluctant countries to do things contrary to their interest, the harder it is, the more costly it is, and therefore the more impractical.
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