During the Middle Ages, Paris was a center of Jewish learning with famous Talmudic scholars, such as Yechiel of Paris who took part in the Disputation of Paris between Christian and Jewish intellectuals. The Parisian Jewish community was victim of persecution, alternating expulsions and returns, until France became the first country in Europe to emancipate its Jewish population during the French Revolution. Although 75% of the Jewish population in France survived the Holocaust during World War II, half the city's Jewish population perished in Nazi concentration camps, while some others fled abroad. A large migration of North Africa Sephardic Jews settled Paris in the 1960s, and represent most of the Paris Jewish community today. There are currently 83 synagogues in the city; The Marais-quarter Agoudas Hakehilos Synagogue, built in 1913 by architect Hector Guimard, is a Paris landmark.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who built the Marais-quarter Agodudas Hakehilos Synagogue?
Ah, so.. Hector Guimard

European colonialism in the Sahara began in the 19th century. France conquered the regency of Algiers from the Ottomans in 1830, and French rule spread south from Algeria and eastwards from Senegal into the upper Niger to include present-day Algeria, Chad, Mali then French Sudan including Timbuktu, Mauritania, Morocco (1912), Niger, and Tunisia (1881). By the beginning of the 20th century, the trans-Saharan trade had clearly declined because goods were moved through more modern and efficient means, such as airplanes, rather than across the desert.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What year did France conquer Niger?
Ah, so.. unanswerable

Roads in the US have been paved with materials that include asphalt/bitumen since at least 1870, when a street in front of the Newark, NJ City Hall was paved. In many cases, these early pavings were made from naturally occurring "bituminous rock", such as at Ritchie Mines in Macfarlan in Ritchie County, West Virginia from 1852 to 1873. In 1876, asphalt-based paving was used to pave Pennsylvania Avenue in Washington, DC, in time for the celebration of the national centennial. Asphalt/bitumen was also used for flooring, paving and waterproofing of baths and swimming pools during the early 20th century, following similar trends in Europe.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What was Ritchie Mines used to waterproof during the 20th century?
Ah, so..
unanswerable