Problem: In contrast to the entirely digital DVD, LaserDiscs use only analog video. As the LaserDisc format is not digitally encoded and does not make use of compression techniques, it is immune to video macroblocking (most visible as blockiness during high motion sequences) or contrast banding (subtle visible lines in gradient areas, such as out-of-focus backgrounds, skies, or light casts from spotlights) that can be caused by the MPEG-2 encoding process as video is prepared for DVD. Early DVD releases held the potential to surpass their LaserDisc counterparts, but often managed only to match them for image quality, and in some cases, the LaserDisc version was preferred. However, proprietary human-assisted encoders manually operated by specialists can vastly reduce the incidence of artifacts, depending on playing time and image complexity. By the end of LaserDisc's run, DVDs were living up to their potential as a superior format.
What step of the DVD production process causes contrast banding?
The answer is the following: MPEG-2 encoding process

Problem: In July 1956, Nasser unilaterally nationalised the Suez Canal. The response of Anthony Eden, who had succeeded Churchill as Prime Minister, was to collude with France to engineer an Israeli attack on Egypt that would give Britain and France an excuse to intervene militarily and retake the canal. Eden infuriated US President Dwight D. Eisenhower, by his lack of consultation, and Eisenhower refused to back the invasion. Another of Eisenhower's concerns was the possibility of a wider war with the Soviet Union after it threatened to intervene on the Egyptian side. Eisenhower applied financial leverage by threatening to sell US reserves of the British pound and thereby precipitate a collapse of the British currency. Though the invasion force was militarily successful in its objectives, UN intervention and US pressure forced Britain into a humiliating withdrawal of its forces, and Eden resigned.
Who decided to sell US reserves of the British pound to cause the pound to collapse?
The answer is the following: Eisenhower

Problem: For a brief period in the 1790s, the British tried to establish a rival foothold on an offshore island, at Bolama. But by the 19th century the Portuguese were sufficiently secure in Bissau to regard the neighbouring coastline as their own special territory, also up north in part of present South Senegal.
Who tried to establish a rival foothold at Bolama?
The answer is the following: the British

Problem: Height limits in the Melbourne CBD were lifted in 1958, after the construction of ICI House, transforming the city's skyline with the introduction of skyscrapers. Suburban expansion then intensified, serviced by new indoor malls beginning with Chadstone Shopping Centre. The post-war period also saw a major renewal of the CBD and St Kilda Road which significantly modernised the city. New fire regulations and redevelopment saw most of the taller pre-war CBD buildings either demolished or partially retained through a policy of facadism. Many of the larger suburban mansions from the boom era were also either demolished or subdivided.
What happened to many of the larger suburban mansions from the boom era?
The answer is the following:
demolished or subdivided