Problem: Infrared reflectography (fr; it; es), as called by art conservators, can be applied to paintings to reveal underlying layers in a completely non-destructive manner, in particular the underdrawing or outline drawn by the artist as a guide. This often reveals the artist's use of carbon black, which shows up well in reflectograms, as long as it has not also been used in the ground underlying the whole painting. Art conservators are looking to see whether the visible layers of paint differ from the underdrawing or layers in between such alterations are called pentimenti when made by the original artist. This is very useful information in deciding whether a painting is the prime version by the original artist or a copy, and whether it has been altered by over-enthusiastic restoration work. In general, the more pentimenti the more likely a painting is to be the prime version. It also gives useful insights into working practices.
What is useful to show if a painting is original or part of a reflectogram?
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Answer: unanswerable

Problem: The earliest extant samples of connected (north) Estonian are the so-called Kullamaa prayers dating from 1524 and 1528. In 1525 the first book published in the Estonian language was printed. The book was a Lutheran manuscript, which never reached the reader and was destroyed immediately after publication.
What manuscript was written in 1528?
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Answer: unanswerable

Problem: Metropolitan Kathmandu is divided into five sectors: the Central Sector, the East Sector, the North Sector, the City Core and the West Sector. For civic administration, the city is further divided into 35 administrative wards. The Council administers the Metropolitan area of Kathmandu city through its 177 elected representatives and 20 nominated members. It holds biannual meetings to review, process and approve the annual budget and make major policy decisions. The ward's profile documents for the 35 wards prepared by the Kathmandu Metropolitan Council is detailed and provides information for each ward on population, the structure and condition of houses, the type of roads, educational, health and financial institutions, entertainment facilities, parking space, security provisions, etc. It also includes lists of development projects completed, on-going and planned, along with informative data about the cultural heritage, festivals, historical sites and the local inhabitants. Ward 16 is the largest, with an area of 437.4 ha; ward 26 is the smallest, with an area of 4 ha.
How many hectares in size is Kathmandu's ward 26?
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Answer:
4