Input: Read this: Bitumen was used in early photographic technology. In 1826 or 1827, it was used by French scientist Joseph Nicephore Niepce to make the oldest surviving photograph from nature. The bitumen was thinly coated onto a pewter plate which was then exposed in a camera. Exposure to light hardened the bitumen and made it insoluble, so that when it was subsequently rinsed with a solvent only the sufficiently light-struck areas remained. Many hours of exposure in the camera were required, making bitumen impractical for ordinary photography, but from the 1850s to the 1920s it was in common use as a photoresist in the production of printing plates for various photomechanical printing processes.[not in citation given]
Question: What feature of bitumen use in photography made it impractical?

Output: hours of exposure

Input: Read this: The rebels soon split into various factions fighting one another. The Economic Community Monitoring Group under the Economic Community of West African States organized a military task force to intervene in the crisis. From 1989 to 1996 one of Africa's bloodiest civil wars ensued, claiming the lives of more than 200,000 Liberians and displacing a million others into refugee camps in neighboring countries. A peace deal between warring parties was reached in 1995, leading to Taylor's election as president in 1997.
Question: In what year did rebels kill 200,000 refugees?

Output: unanswerable

Input: Read this: Some mozni (Magnates) descending from past tribal dynasties regarded themselves as co-proprietors of Piast realms, even though the Piasts attempted to deprive them of their independence. These mozni (Magnates) constantly sought to undermine princely authority.:75, 76 In Gall Anonym's chronicle, there is noted the nobility's alarm when the Palatine Sieciech "elevated those of a lower class over those who were noble born" entrusting them with state offices. (Manteuffel 1982, p. 149)
Question: Who constantly sought to undermine princely authority?

Output: mozni

Input: Read this: Jan Joosten van Lodensteijn (1556?1623?), a Dutch colleague of Adams' on their ill-fated voyage to Japan in the ship De Liefde, was also given similar privileges by Tokugawa Ieyasu. It appears Joosten became a samurai[citation needed] and was given a residence within Ieyasu's castle at Edo. Today, this area at the east exit of Tokyo Station is known as Yaesu (). Yaesu is a corruption of the Dutchman's Japanese name, Yayousu (). Also in common with Adam's, Joostens was given a Red Seal Ship () allowing him to trade between Japan and Indo-China. On a return journey from Batavia Joosten drowned after his ship ran aground.
Question: How did Jan Joosten van Lodensteijn die?

Output:
drowned after his ship ran aground