Problem: Anti-aircraft warfare:

The solution was automation, in the form of a mechanical computer, the Kerrison Predictor. Operators kept it pointed at the target, and the Predictor then calculated the proper aim point automatically and displayed it as a pointer mounted on the gun. The gun operators simply followed the pointer and loaded the shells. The Kerrison was fairly simple, but it pointed the way to future generations that incorporated radar, first for ranging and later for tracking. Similar predictor systems were introduced by Germany during the war, also adding radar ranging as the war progressed.

What did the Predictor calculate after it was pointed at a target?
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A: the proper aim point automatically

Problem: The works of Virgil almost from the moment of their publication revolutionized Latin poetry. The Eclogues, Georgics, and above all the Aeneid became standard texts in school curricula with which all educated Romans were familiar. Poets following Virgil often refer intertextually to his works to generate meaning in their own poetry. The Augustan poet Ovid parodies the opening lines of the Aeneid in Amores 1.1.12, and his summary of the Aeneas story in Book 14 of the Metamorphoses, the so-called "mini-Aeneid", has been viewed as a particularly important example of post-Virgilian response to the epic genre. Lucan's epic, the Bellum Civile has been considered an anti-Virgilian epic, disposing with the divine mechanism, treating historical events, and diverging drastically from Virgilian epic practice. The Flavian poet Statius in his 12-book epic Thebaid engages closely with the poetry of Virgil; in his epilogue he advises his poem not to "rival the divine Aeneid, but follow afar and ever venerate its footsteps." In Silius Italicus, Virgil finds one of his most ardent admirers. With almost every line of his epic Punica Silius references Virgil. Indeed, Silius is known to have bought Virgil's tomb and worshipped the poet. Partially as a result of his so-called "Messianic" Fourth Ecloguewidely interpreted later to have predicted the birth of Jesus ChristVirgil was in later antiquity imputed to have the magical abilities of a seer; the Sortes Vergilianae, the process of using Virgil's poetry as a tool of divination, is found in the time of Hadrian, and continued into the Middle Ages. In a similar vein Macrobius in the Saturnalia credits the work of Virgil as the embodiment of human knowledge and experience, mirroring the Greek conception of Homer. Virgil also found commentators in antiquity. Servius, a commentator of the 4th century AD, based his work on the commentary of Donatus. Servius' commentary provides us with a great deal of information about Virgil's life, sources, and references; however, many modern scholars find the variable quality of his work and the often simplistic interpretations frustrating.
Who bought Virgil's tomb?
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Answer: Silius

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The Catholic Church has what is claimed to be the oldest continuously functioning internal legal system in Western Europe, much later than Roman law but predating the evolution of modern European civil law traditions. What began with rules ("canons") adopted by the Apostles at the Council of Jerusalem in the first century has developed into a highly complex legal system encapsulating not just norms of the New Testament, but some elements of the Hebrew (Old Testament), Roman, Visigothic, Saxon, and Celtic legal traditions.
What is the term for laws produced at the Council of Jerusalem?
A: canons

Context and question: After the Estonian War of Independence in 1919, the Estonian language became the state language of the newly independent country. In 1945, 97.3% of Estonia considered itself ethnic Estonian and spoke the language.
What year did Estonia's War of Independence take place?
Answer: 1919

Question: Proto-Slavic, the supposed ancestor language of all Slavic languages, is a descendant of common Proto-Indo-European, via a Balto-Slavic stage in which it developed numerous lexical and morphophonological isoglosses with the Baltic languages. In the framework of the Kurgan hypothesis, "the Indo-Europeans who remained after the migrations [from the steppe] became speakers of Balto-Slavic".
Is there an answer to this question: Who became speakers of Balto-Slavic?

Answer: Indo-Europeans

Problem: Cubism:

Cubist sculpture developed in parallel to Cubist painting. During the autumn of 1909 Picasso sculpted Head of a Woman (Fernande) with positive features depicted by negative space and vice versa. According to Douglas Cooper: "The first true Cubist sculpture was Picasso's impressive Woman's Head, modeled in 190910, a counterpart in three dimensions to many similar analytical and faceted heads in his paintings at the time." These positive/negative reversals were ambitiously exploited by Alexander Archipenko in 191213, for example in Woman Walking. Joseph Csaky, after Archipenko, was the first sculptor in Paris to join the Cubists, with whom he exhibited from 1911 onwards. They were followed by Raymond Duchamp-Villon and then in 1914 by Jacques Lipchitz, Henri Laurens and Ossip Zadkine.

When was Leg of a Woman sculpted?
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A:
unanswerable