Problem: I know that the answer to the question "Who wrote a book first?" is in "In the early 11th century, the Muslim physicist Ibn al-Haytham (Alhacen or Alhazen) discussed space perception and its epistemological implications in his Book of Optics (1021), he also rejected Aristotle's definition of topos (Physics IV) by way of geometric demonstrations and defined place as a mathematical spatial extension. His experimental proof of the intromission model of vision led to changes in the understanding of the visual perception of space, contrary to the previous emission theory of vision supported by Euclid and Ptolemy. In "tying the visual perception of space to prior bodily experience, Alhacen unequivocally rejected the intuitiveness of spatial perception and, therefore, the autonomy of vision. Without tangible notions of distance and size for correlation, sight can tell us next to nothing about such things."". Can you tell me what it is?

A: Aristotle

Problem: I know that the answer to the question "Which happened 1st, the formation of the Initiative Committee for the Renewal of the Ukrainian Autocephalous Orthodox Church was announced or Lviv and Kiev celebrated Ukrainian Independence Day?" is in "In Ukraine, Lviv and Kiev celebrated Ukrainian Independence Day on January 22, 1989. Thousands gathered in Lviv for an unauthorized moleben (religious service) in front of St. George's Cathedral. In Kiev, 60 activists met in a Kiev apartment to commemorate the proclamation of the Ukrainian People's Republic in 1918. On February 1112, 1989, the Ukrainian Language Society held its founding congress. On February 15, 1989, the formation of the Initiative Committee for the Renewal of the Ukrainian Autocephalous Orthodox Church was announced. The program and statutes of the movement were proposed by the Writers Association of Ukraine and were published in the journal Literaturna Ukraina on February 16, 1989. The organization heralded Ukrainian dissidents such as Vyacheslav Chornovil.". Can you tell me what it is?

A: Lviv and Kiev celebrated Ukrainian Independence Day

Problem: I know that the answer to the question "When not at war, who had more power?" is in "In fact, there was an eighth province, the County of Drenthe, but this area was so poor it was exempt from paying federal taxes and as a consequence was denied representation in the States General. Each province was governed by the Provincial States, the main executive official (though not the official head of state) was a raadspensionaris. In times of war, the stadtholder, who commanded the army, would have more power than the raadspensionaris.". Can you tell me what it is?

A: raadspensionaris

Problem: I know that the answer to the question "What happened after the war?" is in "In the words of Labour Member of Parliament George Hardie, the abdication crisis of 1936 did "more for republicanism than fifty years of propaganda". George VI wrote to his brother Edward that in the aftermath of the abdication he had reluctantly assumed "a rocking throne", and tried "to make it steady again". He became king at a point when public faith in the monarchy was at a low ebb. During his reign his people endured the hardships of war, and imperial power was eroded. However, as a dutiful family man and by showing personal courage, he succeeded in restoring the popularity of the monarchy.". Can you tell me what it is?

A:
imperial power was eroded