More difficult are the phishing attempts that direct users to spoof sites that can be difficult to distinguish from the real thing.
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.
The health care provider will also be trying to distinguish common cramping from muscle diseases that can mimic it and be an uncommon side effect of commonly prescribed drugs used to lower cholesterol (such as cholestyramine) or decrease stomach acid (cimetidine or ranitidine).
As it advances into the Tiger's last domain, the army must be careful to distinguish civilians from rebel fighters.
In-game graphics will approach photorealism to a degree we see now in movies like Avatar, and it will be hard to distinguish them from reality.
At times, it may be difficult to distinguish pericardial pain from the pain that occurs with a heart attack.
It should, its manufacturers hope, be able to distinguish a cat from a cat burglar, or detect barely breathing bodies under several metres of rubble after an earthquake.
It means the 4-year-olds taking the test must be able to distinguish a striped hexagon from a striped octagon from another striped octagon whose stripes are in the opposite direction.
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The schools that will feel the pressure most will be those that have failed to distinguish themselves from others in any meaningful way.
So with BMI, Schwarzenegger would be obese, because BMI does not distinguish muscle from fat.
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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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Indeed, it may be hard for most people to distinguish a shallow recession from lacklustre growth.
Type II would be if the intervention fails to distinguish meth users buying Sudafed from those who have colds.
If it were, though, there would be even less to distinguish the insights of most research analysts from those of an ordinary investor.
For instance, it should be possible to distinguish an insurgency with a rigid command structure from a group of smaller, randomly linked units.
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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They claim they wanted to be as far away from the name DVD as possible in order to distinguish themselves, but some say they choose blu instead of blue so they could copyright the name.
The buttons each feature a pair of arrows and, perhaps most notably, can actually be pressed, offering a unique bit of functionality that could help distinguish this device from its rivals in an increasingly competitive smartphone market.
All Nintendo will have to distinguish itself from its future competitors is its controller (which will likely be copied to some degree) and its stable of original IPs which are the reason anyone buys a Nintendo system.
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.
As this article in Nature magazine tells, authenticators are raising their game, trying to perfect the extraction and purification of grape-skin DNA from bottles of wine, in the hope they will be able to reliably distinguish between the 2, 500 grape varieties.
But as the case proceeds, we can be confident that Samsung will remind the jurors that if they can tell peanut butter apart from turkey, they can distinguish Samsung and iPhones, too.
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It's not unusual for a device to be sold under a couple of different names for the purposes of carrier branding, or to distinguish a global GSM model from its US bound LTE sibling.
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