Context and question: The first commercial LEDs were commonly used as replacements for incandescent and neon indicator lamps, and in seven-segment displays, first in expensive equipment such as laboratory and electronics test equipment, then later in such appliances as TVs, radios, telephones, calculators, as well as watches (see list of signal uses). Until 1968, visible and infrared LEDs were extremely costly, in the order of US$200 per unit, and so had little practical use. The Monsanto Company was the first organization to mass-produce visible LEDs, using gallium arsenide phosphide (GaAsP) in 1968 to produce red LEDs suitable for indicators. Hewlett Packard (HP) introduced LEDs in 1968, initially using GaAsP supplied by Monsanto. These red LEDs were bright enough only for use as indicators, as the light output was not enough to illuminate an area. Readouts in calculators were so small that plastic lenses were built over each digit to make them legible. Later, other colors became widely available and appeared in appliances and equipment. In the 1970s commercially successful LED devices at less than five cents each were produced by Fairchild Optoelectronics. These devices employed compound semiconductor chips fabricated with the planar process invented by Dr. Jean Hoerni at Fairchild Semiconductor. The combination of planar processing for chip fabrication and innovative packaging methods enabled the team at Fairchild led by optoelectronics pioneer Thomas Brandt to achieve the needed cost reductions. These methods continue to be used by LED producers.
What modern company introduced LEDs in 1968?
Answer: Hewlett Packard (HP)
Context and question: Contemporary Eastern Orthodox Christians often object to the dogmatic declaration of her immaculate conception as an "over-elaboration" of the faith and because they see it as too closely connected with a particular interpretation of the doctrine of ancestral sin. All the same, the historical and authentic tradition of Mariology in Byzantium took its historical point of departure from Sophronios, Damascene, and their imitators. The most famous Eastern Orthodox theologian to imply Mary's Immaculate Conception was St. Gregory Palamas. Though many passages from his works were long known to extol and attribute to Mary a Christlike holiness in her human nature, traditional objections to Palamas' disposition toward the Immaculate Conception typically rely on a poor understanding of his doctrine of "the purification of Mary" at the Annunciation. Not only did he explicitly cite St. Gregory Nazianzen for his understanding of Jesus' purification at His baptism and Mary's at the Annunciation, but Theophanes of Nicaea, Joseph Bryennius, and Gennadios Scholarios all explicitly placed Mary's Conception as the first moment of her all-immaculate participation in the divine energies to such a degree that she was always completely without spot and graced. In addition to Emperor Manuel II and Gennadius Scholarius, St. Mark of Ephesus also fervently defended Mary's title as "prepurified" against the Dominican, Manuel Calecas, who was perhaps promoting thomistic Mariology that denied Mary's all-holiness from the first moment of her existence.
What in particular does the group feels is impossible to believe ?
Answer: because they see it as too closely connected with a particular interpretation of the doctrine of ancestral sin.
Context and question: Before the 1997 war, about 9,000 Europeans and other non-Africans lived in Congo, most of whom were French; only a fraction of this number remains. Around 300 American expatriates reside in the Congo.
How many Congolese expatriates live in America?
Answer:
unanswerable