Input: Read this: Infrared radiation is used in industrial, scientific, and medical applications. Night-vision devices using active near-infrared illumination allow people or animals to be observed without the observer being detected. Infrared astronomy uses sensor-equipped telescopes to penetrate dusty regions of space, such as molecular clouds; detect objects such as planets, and to view highly red-shifted objects from the early days of the universe. Infrared thermal-imaging cameras are used to detect heat loss in insulated systems, to observe changing blood flow in the skin, and to detect overheating of electrical apparatus.
Question: What technology is used by night vision devices to observe changing blood flow in the skin?

Output: unanswerable

Input: Read this: Before the 1997 war, about 9,000 Europeans and other non-Africans lived in Congo, most of whom were French; only a fraction of this number remains. Around 300 American expatriates reside in the Congo.
Question: How many Congolese expatriates live in America?

Output: unanswerable

Input: Read this: The Shunga Empire or Shunga Empire was an ancient Indian dynasty from Magadha that controlled vast areas of the Indian subcontinent from around 187 to 78 BCE. The dynasty was established by Pushyamitra Shunga, after the fall of the Maurya Empire. Its capital was Pataliputra, but later emperors such as Bhagabhadra also held court at Besnagar, modern Vidisha in Eastern Malwa. Pushyamitra Shunga ruled for 36 years and was succeeded by his son Agnimitra. There were ten Shunga rulers. The empire is noted for its numerous wars with both foreign and indigenous powers. They fought battles with the Kalingas, Satavahanas, the Indo-Greeks, and possibly the Panchalas and Mathuras. Art, education, philosophy, and other forms of learning flowered during this period including small terracotta images, larger stone sculptures, and architectural monuments such as the Stupa at Bharhut, and the renowned Great Stupa at Sanchi. The Shunga rulers helped to establish the tradition of royal sponsorship of learning and art. The script used by the empire was a variant of Brahmi and was used to write the Sanskrit language. The Shunga Empire played an imperative role in patronizing Indian culture at a time when some of the most important developments in Hindu thought were taking place.
Question: What was the time span of the Shunga Empire?

Output: 187 to 78 BCE

Input: Read this: There are several major exceptions on tuition fees. In many European countries, it is possible to study without tuition fees. Public universities in Nordic countries were entirely without tuition fees until around 2005. Denmark, Sweden and Finland then moved to put in place tuition fees for foreign students. Citizens of EU and EEA member states and citizens from Switzerland remain exempted from tuition fees, and the amounts of public grants granted to promising foreign students were increased to offset some of the impact.
Question: What kind of students pay fees in public universities in the UK?

Output:
unanswerable