I know that the answer to the question "What was the problem at the end?" is in "Whitehall's disquiet at the failures of the RAF led to the replacement of Dowding (who was already due for retirement) with Sholto Douglas on 25 November. Douglas set about introducing more squadrons and dispersing the few GL sets to create a carpet effect in the southern counties. Still, in February 1941, there remained only seven squadrons with 87 pilots, under half the required strength. The GL carpet was supported by six GCI sets controlling radar-equipped night-fighters. By the height of the Blitz, they were becoming more successful. The number of contacts and combats rose in 1941, from 44 and two in 48 sorties in January 1941, to 204 and 74 in May (643 sorties). But even in May, 67% of the sorties were visual cat's-eye missions. Curiously, while 43% of the contacts in May 1941 were by visual sightings, they accounted for 61% of the combats. Yet when compared with Luftwaffe daylight operations, there was a sharp decline in German losses to 1%. If a vigilant bomber crew could spot the fighter first, they had a decent chance at evading it.". Can you tell me what it is?
Ans: If a vigilant bomber crew could spot the fighter first, they had a decent chance at evading it

I know that the answer to the question "What the settlement that is now the capital of the land now ruled by Elizabeth II was effectively refounded by a ruler from the western part of an area in eastern Germany?" is in "The Vikings established Danelaw over much of the eastern and northern part of England with its boundary roughly stretching from London to Chester. It was an area of political and geographical control imposed by the Viking incursions which was formally agreed to by the Danish warlord, Guthrum and west-Saxon king, Alfred the Great in 886 AD. The Anglo-Saxon Chronicle recorded that London was "refounded" by Alfred the Great in 886. Archaeological research shows that this involved abandonment of Lundenwic and a revival of life and trade within the old Roman walls. London then grew slowly until about 950, after which activity increased dramatically.". Can you tell me what it is?
Ans: London

I know that the answer to the question "What did Jesus's family do with his message?" is in "The hagiography of Mary and the Holy Family can be contrasted with other material in the Gospels. These references include an incident which can be interpreted as Jesus rejecting his family in the New Testament: "And his mother and his brothers arrived, and standing outside, they sent in a message asking for him ... And looking at those who sat in a circle around him, Jesus said, 'These are my mother and my brothers. Whoever does the will of God is my brother, and sister, and mother'."[3:31-35] Other verses suggest a conflict between Jesus and his family, including an attempt to have Jesus restrained because "he is out of his mind", and the famous quote: "A prophet is not without honor except in his own town, among his relatives and in his own home." A leading Biblical scholar commented: "there are clear signs not only that Jesus's family rejected his message during his public ministry but that he in turn spurned them publicly".". Can you tell me what it is?
Ans: rejected his message during his public ministry but that he in turn spurned them publicly

I know that the answer to the question "What are the things that are necessary for this process to function?" is in "The development of quadraphonic records was announced in 1971. These recorded four separate sound signals. This was achieved on the two stereo channels by electronic matrixing, where the additional channels were combined into the main signal. When the records were played, phase-detection circuits in the amplifiers were able to decode the signals into four separate channels. There were two main systems of matrixed quadraphonic records produced, confusingly named SQ (by CBS) and QS (by Sansui). They proved commercially unsuccessful, but were an important precursor to later surround-sound systems, as seen in SACD and home cinema today.". Can you tell me what it is?
Ans: phase-detection circuits in the amplifiers