Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In infrared photography, infrared filters are used to capture the near-infrared spectrum. Digital cameras often use infrared blockers. Cheaper digital cameras and camera phones have less effective filters and can "see" intense near-infrared, appearing as a bright purple-white color. This is especially pronounced when taking pictures of subjects near IR-bright areas (such as near a lamp), where the resulting infrared interference can wash out the image. There is also a technique called 'T-ray' imaging, which is imaging using far-infrared or terahertz radiation. Lack of bright sources can make terahertz photography more challenging than most other infrared imaging techniques. Recently T-ray imaging has been of considerable interest due to a number of new developments such as terahertz time-domain spectroscopy.
What is used in infrared photography to capture the near-infrared spectrum?
A: infrared filters

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In the following two decades after Sianis' ill will, the Cubs played mostly forgettable baseball, finishing among the worst teams in the National League on an almost annual basis. Longtime infielder/manager Phil Cavarretta, who had been a key player during the '45 season, was fired during spring training in 1954 after admitting the team was unlikely to finish above fifth place. Although shortstop Ernie Banks would become one of the star players in the league during the next decade, finding help for him proved a difficult task, as quality players such as Hank Sauer were few and far between. This, combined with poor ownership decisions such as the College of Coaches, and the ill-fated trade of future Hall of Famer Lou Brock to the Cardinals for pitcher Ernie Broglio (who won only 7 games over the next three seasons), hampered on-field performance.
Who was fired during spring training in 1954 after admitting the Cubs were unlikely to finish above fifth place?
A: Phil Cavarretta

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Windows RT, the only edition of Windows 8 for systems with ARM processors, only supports applications included with the system (such as a special version of Office 2013), supplied through Windows Update, or Windows Store apps, to ensure that the system only runs applications that are optimized for the architecture. Windows RT does not support running IA-32 or x64 applications. Windows Store apps can either support both the x86 and ARM architectures, or compiled to support a specific architecture.
What apps don't work on Windows RT?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Igor returned to Kiev keen for revenge. He assembled a large force of warriors from among neighboring Slavs and Pecheneg allies, and sent for reinforcements of Varangians from "beyond the sea." In 944 the Rus' force advanced again on the Greeks, by land and sea, and a Byzantine force from Cherson responded. The Emperor sent gifts and offered tribute in lieu of war, and the Rus' accepted. Envoys were sent between the Rus', the Byzantines, and the Bulgarians in 945, and a peace treaty was completed. The agreement again focused on trade, but this time with terms less favorable to the Rus', including stringent regulations on the conduct of Rus' merchants in Cherson and Constantinople and specific punishments for violations of the law. The Byzantines may have been motivated to enter the treaty out of concern of a prolonged alliance of the Rus', Pechenegs, and Bulgarians against them, though the more favorable terms further suggest a shift in power.
What year did the Rus defeat the Byzantines the the Bulgarians?
A:
unanswerable