Problem: Mandolin:

At the very end of the 19th century, a new style, with a carved top and back construction inspired by violin family instruments began to supplant the European-style bowl-back instruments in the United States. This new style is credited to mandolins designed and built by Orville Gibson, a Kalamazoo, Michigan luthier who founded the "Gibson Mandolin-Guitar Manufacturing Co., Limited" in 1902. Gibson mandolins evolved into two basic styles: the Florentine or F-style, which has a decorative scroll near the neck, two points on the lower body and usually a scroll carved into the headstock; and the A-style, which is pear shaped, has no points and usually has a simpler headstock.

When was a old style of carved top and back construction mandolins created?
---
A: unanswerable

Problem: Though they have not had the level of exposure as other wrestlers, bears have long been a part of professional wrestling. Usually declawed and muzzled, they often wrestled shoot matches against audience members, offered a cash reward if they could pin the bear. They also wrestled professionals in worked, often battle royal or handicap, matches (usually booked so the bear won). Though they have wrestled around the world and continue to do so, wrestling bears enjoyed their greatest popularity in the Southern United States, during the 1960s and 1970s. The practice of bear wrestling has met strong opposition from animal rights activists in recent decades, contributing to its lack of mainstream acceptance. As of 2006, it is banned in 20 U.S. states. Perhaps the most famous wrestling bears are Ginger, Victor, Hercules and Terrible Ted.
Who are the most well-known wrestling bears?
---
Answer: Ginger, Victor, Hercules and Terrible Ted

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Calcined uranium yellowcake, as produced in many large mills, contains a distribution of uranium oxidation species in various forms ranging from most oxidized to least oxidized. Particles with short residence times in a calciner will generally be less oxidized than those with long retention times or particles recovered in the stack scrubber. Uranium content is usually referenced to U
3O
8, which dates to the days of the Manhattan project when U
3O
8 was used as an analytical chemistry reporting standard.
What contains a distribution of uranium deoxidation species in various forms ranging from most oxidized to least oxidized?
A: unanswerable

Context and question: After Germany entered a Tripartite Pact with Japan and Italy, Ribbentrop wrote to Stalin, inviting Molotov to Berlin for negotiations aimed to create a 'continental bloc' of Germany, Italy, Japan and the USSR that would oppose Britain and the USA. Stalin sent Molotov to Berlin to negotiate the terms for the Soviet Union to join the Axis and potentially enjoy the spoils of the pact. After negotiations during November 1940 on where to extend the USSR's sphere of influence, Hitler broke off talks and continued planning for the eventual attempts to invade the Soviet Union.
Which Foreign Minister proposed that the Soviets should reject this agreement of axis powers?
Answer: unanswerable

Question: Rothko also began using the new synthetic pigments, but not always with happy results. In 1962 he donated to Harvard University a series of large murals of the Passion of Christ whose predominant colors were dark pink and deep crimson. He mixed mostly traditional colors to make the pink and crimson; synthetic ultramarine, cerulean blue, and titanium white, but he also used two new organic reds, Naphtol and Lithol. The Naphtol did well, but the Lithol slowly changed color when exposed to light. Within five years the deep pinks and reds had begun to turn light blue, and by 1979 the paintings were ruined and had to be taken down.
Is there an answer to this question: Who first used synthetic pigments in 1962?

Answer: unanswerable

Jordanes tells us that the Sclaveni had swamps and forests for their cities. Another 6th-century source refers to them living among nearly impenetrable forests, rivers, lakes, and marshes.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Where did Jordanes live?
Ah, so..
unanswerable