Article: In the medieval Middle Eastern world, the physicist and Islamic scholar, Al-Farabi (Alpharabius, 872950), conducted a small experiment concerning the existence of vacuum, in which he investigated handheld plungers in water.[unreliable source?] He concluded that air's volume can expand to fill available space, and he suggested that the concept of perfect vacuum was incoherent. However, according to Nader El-Bizri, the physicist Ibn al-Haytham (Alhazen, 9651039) and the Mu'tazili theologians disagreed with Aristotle and Al-Farabi, and they supported the existence of a void. Using geometry, Ibn al-Haytham mathematically demonstrated that place (al-makan) is the imagined three-dimensional void between the inner surfaces of a containing body. According to Ahmad Dallal, Abu Rayhan al-Biruni also states that "there is no observable evidence that rules out the possibility of vacuum". The suction pump later appeared in Europe from the 15th century.

Question: what did Al-Farabi say expanded to fill available space
Ans: air's volume

Article: Notable modern Greek artists include Renaissance painter Dominikos Theotokopoulos (El Greco), Panagiotis Doxaras, Nikolaos Gyzis, Nikiphoros Lytras, Yannis Tsarouchis, Nikos Engonopoulos, Constantine Andreou, Jannis Kounellis, sculptors such as Leonidas Drosis, Georgios Bonanos, Yannoulis Chalepas and Joannis Avramidis, conductor Dimitri Mitropoulos, soprano Maria Callas, composers such as Mikis Theodorakis, Nikos Skalkottas, Iannis Xenakis, Manos Hatzidakis, Eleni Karaindrou, Yanni and Vangelis, one of the best-selling singers worldwide Nana Mouskouri and poets such as Kostis Palamas, Dionysios Solomos, Angelos Sikelianos and Yannis Ritsos. Alexandrian Constantine P. Cavafy and Nobel laureates Giorgos Seferis and Odysseas Elytis are among the most important poets of the 20th century. Novel is also represented by Alexandros Papadiamantis and Nikos Kazantzakis.

Question: Who was one of the old masters from the Greeks ?
Ans: Greek artists include Renaissance painter Dominikos Theotokopoulos (El Greco), Panagiotis Do

Article: Dell sells personal computers (PCs), servers, data storage devices, network switches, software, computer peripherals, HDTVs, cameras, printers, MP3 players, and electronics built by other manufacturers. The company is well known for its innovations in supply chain management and electronic commerce, particularly its direct-sales model and its "build-to-order" or "configure to order" approach to manufacturingdelivering individual PCs configured to customer specifications. Dell was a pure hardware vendor for much of its existence, but with the acquisition in 2009 of Perot Systems, Dell entered the market for IT services. The company has since made additional acquisitions in storage and networking systems, with the aim of expanding their portfolio from offering computers only to delivering complete solutions for enterprise customers.

Question: What company did Dell acquire in 2009?
Ans: Perot Systems

Article: According to the Mahasaccakasutta,[note 33] from the fourth jhana the Buddha gained bodhi. Yet, it is not clear what he was awakened to.[page needed] "Liberating insight" is a later addition to this text, and reflects a later development and understanding in early Buddhism.[page needed][page needed] The mentioning of the four truths as constituting "liberating insight" introduces a logical problem, since the four truths depict a linear path of practice, the knowledge of which is in itself not depicted as being liberating.[note 34]

Question: A logic problem arises when noting that the four truths constitute what?
Ans:
liberating insight