Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The reason for this is that in this definition, electromagnetic radiation (such as light) as well as the energy of electromagnetic fields contributes to the mass of systems, and therefore appears to add matter to them. For example, light radiation (or thermal radiation) trapped inside a box would contribute to the mass of the box, as would any kind of energy inside the box, including the kinetic energy of particles held by the box. Nevertheless, isolated individual particles of light (photons) and the isolated kinetic energy of massive particles, are normally not considered to be matter.[citation needed]
What is another name for isolated kinetic energy of massive particles?
A: unanswerable

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This period also saw some contacts with Jesuits and Capuchins from Europe, and in 1774 a Scottish nobleman, George Bogle, came to Shigatse to investigate prospects of trade for the British East India Company. However, in the 19th century the situation of foreigners in Tibet grew more tenuous. The British Empire was encroaching from northern India into the Himalayas, the Emirate of Afghanistan and the Russian Empire were expanding into Central Asia and each power became suspicious of the others' intentions in Tibet.
Who came to Shigatse in 1747?
A: unanswerable

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The people of Somerset are mentioned in the Anglo-Saxon Chronicle's entry for AD 845, in the inflected form "Sumursætum", and the county is recorded in the entry for 1015 using the same name. The archaic name Somersetshire was mentioned in the Chronicle's entry for 878. Although "Somersetshire" was in common use as an alternative name for the county, it went out of fashion in the late 19th century, and is no longer used possibly due to the adoption of "Somerset" as the county's official name after the establishment of the county council in 1889. As with other counties not ending in "shire," the suffix was superfluous, as there was no need to differentiate between the county and a town within it.
In what year did people stop using the term "Sumursaetum" for this county?
A: unanswerable

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The German Empire conquered Ukraine during World War I and was planning on either annexing it or installing a puppet king, but was defeated by the Entente, with major involvement by the Ukrainian Bolsheviks. After conquering the rest of Ukraine from the Whites, Ukraine joined the USSR and was enlarged (gaining Crimea and then Eastern Galicia), whence a process of Ukrainization was begun, with encouragement from Moscow.
What nation conquered Ukraine during the First World War?
A:
The German Empire