Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
As is known from the "Sumerian Farmer's Almanac", after the flood season and after the Spring Equinox and the Akitu or New Year Festival, using the canals, farmers would flood their fields and then drain the water. Next they made oxen stomp the ground and kill weeds. They then dragged the fields with pickaxes. After drying, they plowed, harrowed, and raked the ground three times, and pulverized it with a mattock, before planting seed. Unfortunately the high evaporation rate resulted in a gradual increase in the salinity of the fields. By the Ur III period, farmers had switched from wheat to the more salt-tolerant barley as their principal crop.
What people first wrote an Almanac?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
During this period the practice of manuscript illumination gradually passed from monasteries to lay workshops, so that according to Janetta Benton "by 1300 most monks bought their books in shops", and the book of hours developed as a form of devotional book for lay-people. Metalwork continued to be the most prestigious form of art, with Limoges enamel a popular and relatively affordable option for objects such as reliquaries and crosses. In Italy the innovations of Cimabue and Duccio, followed by the Trecento master Giotto (d. 1337), greatly increased the sophistication and status of panel painting and fresco. Increasing prosperity during the 12th century resulted in greater production of secular art; many carved ivory objects such as gaming-pieces, combs, and small religious figures have survived.
Who noted that 14th century monks bought books in shops?
A: Janetta Benton

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Initially sensors were optical and acoustic devices developed during the First World War and continued into the 1930s, but were quickly superseded by radar, which in turn was supplemented by optronics in the 1980s. Command and control remained primitive until the late 1930s, when Britain created an integrated system for ADGB that linked the ground-based air defence of the army's AA Command, although field-deployed air defence relied on less sophisticated arrangements. NATO later called these arrangements an "air defence ground environment", defined as "the network of ground radar sites and command and control centres within a specific theatre of operations which are used for the tactical control of air defence operations".
Radar was supplemented by what in the 1980s?
A: optronics

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
With the rise of disco in the US and punk rock in the UK, hard rock's mainstream dominance was rivalled toward the later part of the decade. Disco appealed to a more diverse group of people and punk seemed to take over the rebellious role that hard rock once held. Early punk bands like The Ramones explicitly rebelled against the drum solos and extended guitar solos that characterised stadium rock, with almost all of their songs clocking in around two minutes with no guitar solos. However, new rock acts continued to emerge and record sales remained high into the 1980s. 1977 saw the debut and rise to stardom of Foreigner, who went on to release several platinum albums through to the mid-1980s. Midwestern groups like Kansas, REO Speedwagon and Styx helped further cement heavy rock in the Midwest as a form of stadium rock. In 1978, Van Halen emerged from the Los Angeles music scene with a sound based around the skills of lead guitarist Eddie Van Halen. He popularised a guitar-playing technique of two-handed hammer-ons and pull-offs called tapping, showcased on the song "Eruption" from the album Van Halen, which was highly influential in re-establishing hard rock as a popular genre after the punk and disco explosion, while also redefining and elevating the role of electric guitar.
Which Van Halen instrumental showcased the guitar mastery of Eddie Van Halen?
A:
"Eruption"