Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Although there is some evidence of earlier inhabitation in the region of Utrecht, dating back to the Stone Age (app. 2200 BCE) and settling in the Bronze Age (app. 1800800 BCE), the founding date of the city is usually related to the construction of a Roman fortification (castellum), probably built in around 50 CE. A series of such fortresses was built after the Roman emperor Claudius decided the empire should not expand north. To consolidate the border the limes Germanicus defense line was constructed along the main branch of the river Rhine, which at that time flowed through a more northern bed compared to today (what is now the Kromme Rijn). These fortresses were designed to house a cohort of about 500 Roman soldiers. Near the fort settlements would grow housing artisans, traders and soldiers' wives and children.
Where were the soldiers and their wives housed?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Several Muslim countries like Turkey and Iran exhibit high scientific publication. Some countries have tried to encourage scientific research. In Pakistan, establishment of the Higher Education Commission in 2002, resulted in a 5-fold increase in the number of PhDs and a 10-fold increase in the number of scientific research papers in 10 years with the total number of universities increasing from 115 in 2001 to over 400 in 2012.[citation needed] Saudi Arabia has established the King Abdullah University of Science and Technology. United Arab Emirates has invested in Zayed University, United Arab Emirates University, and Masdar Institute of Science and Technology[clarification needed]
How much did the Higher Education Commission impact the number of PhDs in Pakistan?
A: 5-fold increase

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Infrared radiation is popularly known as "heat radiation"[citation needed], but light and electromagnetic waves of any frequency will heat surfaces that absorb them. Infrared light from the Sun accounts for 49% of the heating of Earth, with the rest being caused by visible light that is absorbed then re-radiated at longer wavelengths. Visible light or ultraviolet-emitting lasers can char paper and incandescently hot objects emit visible radiation. Objects at room temperature will emit radiation concentrated mostly in the 8 to 25 m band, but this is not distinct from the emission of visible light by incandescent objects and ultraviolet by even hotter objects (see black body and Wien's displacement law).
What is a commonly used term for infrared radiation?
A: heat radiation

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The early currency of the United States did not exhibit faces of presidents, as is the custom now; although today, by law, only the portrait of a deceased individual may appear on United States currency. In fact, the newly formed government was against having portraits of leaders on the currency, a practice compared to the policies of European monarchs. The currency as we know it today did not get the faces they currently have until after the early 20th century; before that "heads" side of coinage used profile faces and striding, seated, and standing figures from Greek and Roman mythology and composite Native Americans. The last coins to be converted to profiles of historic Americans were the dime (1946) and the Dollar (1971).
Other than Greek and Roman mythology, who else was featured on the "heads" of past monarchs?
A:
unanswerable