Problem: Arena Football League:

The Arena Football League (AFL) is the highest level of professional indoor American football in the United States. It was founded in 1987 by Jim Foster, making it the third longest-running professional football league in North America, after the Canadian Football League and the National Football League. It is played indoors on a 68-yard field (about half the distance of an NFL field), resulting in a faster-paced and higher-scoring game. The sport was invented in the early 1980s and patented by Foster, a former executive of the United States Football League and the National Football League.

Where does the Arena Football League rank amongst professional football leagues in North America by longevity?
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A: third

Problem: Sextus Julius Africanus further refers to the writings of historian Thallus: "This darkness Thallus, in the third book of his History, calls, as appears to me without reason, an eclipse of the sun. For the Hebrews celebrate the passover on the 14th day according to the moon, and the passion of our Saviour falls on the day before the passover; but an eclipse of the sun takes place only when the moon comes under the sun." Christian apologist Tertullian believed the event was documented in the Roman archives.
His book of History was Tertullian's what in a series of books written?
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Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In 1975, a group of Chicago Cubs fans based in Washington, D.C. formed the Emil Verban Society. The society is a select club of high profile Cub fans, currently headed by Illinois Senator Dick Durbin which is named for Emil Verban, who in three seasons with the Cubs in the 1940s batted .280 with 39 runs batted in and one home run. Verban was picked as the epitome of a Cub player, explains columnist George Will, because "He exemplified mediocrity under pressure, he was competent but obscure and typifying of the work ethics." Verban initially believed he was being ridiculed, but his ill feeling disappeared several years later when he was flown to Washington to meet President Ronald Reagan, also a society member, at the White House. Hillary Clinton, Jim Belushi, Joe Mantegna, Rahm Emanuel, Dick Cheney and many others have been included among its membership.
Who currently heads the Emil Verban Society?
A: Illinois Senator Dick Durbin

Context and question: Victoria married her first cousin, Prince Albert of Saxe-Coburg and Gotha, in 1840. Their nine children married into royal and noble families across the continent, tying them together and earning her the sobriquet "the grandmother of Europe". After Albert's death in 1861, Victoria plunged into deep mourning and avoided public appearances. As a result of her seclusion, republicanism temporarily gained strength, but in the latter half of her reign her popularity recovered. Her Golden and Diamond Jubilees were times of public celebration.
Whatyear did Victoria marry Prince Albert?
Answer: 1840

Question: Cossacks, although Slavic-speaking and Orthodox Christians, came from a mix of ethnic backgrounds, including Tatars and other Turks. Many early members of the Terek Cossacks were Ossetians.
Is there an answer to this question: What were many early Tatars?

Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
From outside the United Kingdom and the United States, the Canadian trio Rush released three distinctively hard rock albums in 197475 (Rush, Fly by Night and Caress of Steel) before moving toward a more progressive sound with the 1976 album 2112. The Irish band Thin Lizzy, which had formed in the late 1960s, made their most substantial commercial breakthrough in 1976 with the hard rock album Jailbreak and their worldwide hit "The Boys Are Back in Town", which reached number 8 in the UK and number 12 in the US. Their style, consisting of two duelling guitarists often playing leads in harmony, proved itself to be a large influence on later bands. They reached their commercial, and arguably their artistic peak with Black Rose: A Rock Legend (1979). The arrival of Scorpions from Germany marked the geographical expansion of the subgenre. Australian-formed AC/DC, with a stripped back, riff heavy and abrasive style that also appealed to the punk generation, began to gain international attention from 1976, culminating in the release of their multi-platinum albums Let There Be Rock (1977) and Highway to Hell (1979). Also influenced by a punk ethos were heavy metal bands like Motorhead, while Judas Priest abandoned the remaining elements of the blues in their music, further differentiating the hard rock and heavy metal styles and helping to create the New Wave of British Heavy Metal which was pursued by bands like Iron Maiden, Saxon and Venom.
The band Rush is what nationality?
A:
Canadian