Now, beyond table scraps, store-bought dog food is nearly impossible to distinguish from human food.
This radiation can be detected although Dyson spheres remain difficult to distinguish from natural astronomical objects that give off similar signatures.
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More difficult are the phishing attempts that direct users to spoof sites that can be difficult to distinguish from the real thing.
But that effect is difficult to distinguish from the industry's broader decline.
Because hardship from globalisation is so difficult to distinguish from hardship in general, it would be open season to put up trade barriers in industry after industry.
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However, it is not yet clear how the rule will be applied or how it will prevent some types of proprietary trading that are difficult to distinguish from market-making.
Many accounting and consulting firms, for example, find themselves stumped when choosing from applicant pools full of highly impressive candidates who are hard to distinguish from one from another based on traditional metrics.
Outside these core areas, and at lower altitudes, the culture and farming practices of mountain people can have profound effects on local ecology, making the effects of climate change difficult to distinguish from those directly due to human activities.
Tension headaches can sometimes be difficult to distinguish from migraines, but unlike some forms of migraine, tension headache usually isn't associated with visual disturbances (blind spots or flashing lights), nausea, vomiting, abdominal pain, weakness or numbness on one side of the body, or slurred speech.
This would explain why the Romney campaign has chosen to attempt to distinguish the report from their plan (although there little to distinguish the Romney-Ryan Medicare plan from the model studied by Kaiser) rather than attack the findings of the Kaiser Family Foundation report.
Obama must try to find bipartisan compromise at the same time that many in the GOP are seeking to distinguish themselves from his administration's policies in order to define their candidacy for 2012.
This decision to target customers that were focused on long-term results enabled Baupost to distinguish itself from private equity firms that would sell winning investments quickly in order to justify the high short-term performance they needed to raise more capital from investors.
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Located outside of Shanghai, Suzhou was looking to distinguish itself from its larger-than-life neighboring city.
At the same time, he sought to distinguish himself from Obama on some specific issues.
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As counterfeiters rush to replicate a brand, the brand owners fight to distinguish themselves from the fakes.
This, among other things, helps it to distinguish bacteria from human membranes, which have a less negative charge.
Retailers are trying to distinguish themselves from each other through better customer service, product assortments and advanced technology.
Is PETA even aware that most viewers of the show tune in to distinguish themselves from the cast members?
As it advances into the Tiger's last domain, the army must be careful to distinguish civilians from rebel fighters.
As Kobo's CEO told us, it's with social features that the company expects to distinguish itself from the competition.
They were dressed in blue coveralls and red sandals to distinguish them from the other suspects being brought to court.
Since metal detectors are designed to distinguish gold from iron junk, he dug whenever the machine told him he was passing over rubbish.
Until recently, Middlebury had little to distinguish itself from its reputable New England liberal arts peers besides its rigorous language programs.
The attempt to stimulate the economy further through open market purchases was called quantitative easing to distinguish it from interest-rate easing.
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To distinguish Popchips from the hundreds of other foods in the snack aisle, Mr. Belling focused on word-of-mouth and grass-roots marketing.
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The Internet is, in any case, set up in a way that makes it difficult for computers to distinguish friend from foe.
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To distinguish it from the Aloha system Mr Metcalfe dubbed it "ethernet".
The schools that will feel the pressure most will be those that have failed to distinguish themselves from others in any meaningful way.
Now that welfare reform is under way, Republicans see school choice as the next big opportunity to distinguish themselves from their Democratic rivals.
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