Problem: Light-emitting diode:

Among the challenges being faced to improve the efficiency of LED-based white light sources is the development of more efficient phosphors. As of 2010, the most efficient yellow phosphor is still the YAG phosphor, with less than 10% Stoke shift loss. Losses attributable to internal optical losses due to re-absorption in the LED chip and in the LED packaging itself account typically for another 10% to 30% of efficiency loss. Currently, in the area of phosphor LED development, much effort is being spent on optimizing these devices to higher light output and higher operation temperatures. For instance, the efficiency can be raised by adapting better package design or by using a more suitable type of phosphor. Conformal coating process is frequently used to address the issue of varying phosphor thickness.

What area are scientists looking into regarding phosphor LED development?
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A: higher operation temperatures

Problem: Muammar Gaddafi:

Gaddafi was later infuriated when Egypt and Syria planned the Yom Kippur War against Israel without consulting him, and was angered when Egypt conceded to peace talks rather than continuing the war. Gaddafi become openly hostile to Egypt's leader, calling for Sadat's overthrow, and when Sudanese President Gaafar Nimeiry took Sadat's side, Gaddafi by 1975 sponsored the Sudan People's Liberation Army to overthrow Nimeiry. Focusing his attention elsewhere in Africa, in late 1972 and early 1973, Libya invaded Chad to annex the uranium-rich Aouzou Strip. Offering financial incentives, he successfully convinced 8 African states to break off diplomatic relations with Israel in 1973. Intent on propagating Islam, in 1973 Gaddafi founded the Islamic Call Society, which had opened 132 centres across Africa within a decade. In 1973 he converted Gabonese President Omar Bongo, an action which he repeated three years later with Jean-Bedel Bokassa, president of the Central African Republic.

What element did the Aouzou Strip possess a great deal of?
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A: uranium

Problem: Antarctica:

A census of sea life carried out during the International Polar Year and which involved some 500 researchers was released in 2010. The research is part of the global Census of Marine Life (CoML) and has disclosed some remarkable findings. More than 235 marine organisms live in both polar regions, having bridged the gap of 12,000 km (7,456 mi). Large animals such as some cetaceans and birds make the round trip annually. More surprising are small forms of life such as mudworms, sea cucumbers and free-swimming snails found in both polar oceans. Various factors may aid in their distribution fairly uniform temperatures of the deep ocean at the poles and the equator which differ by no more than 5 C, and the major current systems or marine conveyor belt which transport eggs and larval stages.

Part of what study is the census of Antarctic marine life?
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A: Census of Marine Life

Problem: Eritrea:

Eritrea can be split into three ecoregions. To the east of the highlands are the hot, arid coastal plains stretching down to the southeast of the country. The cooler, more fertile highlands, reaching up to 3000m has a different habitat. Habitats here vary from the sub-tropical rainforest at Filfil Solomona to the precipitous cliffs and canyons of the southern highlands. The Afar Triangle or Danakil Depression of Eritrea is the probable location of a triple junction where three tectonic plates are pulling away from one another.The highest point of the country, Emba Soira, is located in the center of Eritrea, at 3,018 meters (9,902 ft) above sea level.

How high is Filfil Solomona above sea level?
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A:
unanswerable