Article: Some of the most influential theorists on emotion from the 20th century have died in the last decade. They include Magda B. Arnold (19032002), an American psychologist who developed the appraisal theory of emotions; Richard Lazarus (19222002), an American psychologist who specialized in emotion and stress, especially in relation to cognition; Herbert A. Simon (19162001), who included emotions into decision making and artificial intelligence; Robert Plutchik (19282006), an American psychologist who developed a psychoevolutionary theory of emotion; Robert Zajonc (19232008) a PolishAmerican social psychologist who specialized in social and cognitive processes such as social facilitation; Robert C. Solomon (19422007), an American philosopher who contributed to the theories on the philosophy of emotions with books such as What Is An Emotion?: Classic and Contemporary Readings (Oxford, 2003); Peter Goldie (19462011), a British philosopher who specialized in ethics, aesthetics, emotion, mood and character; Nico Frijda (19272015), a Dutch psychologist who advanced the theory that human emotions serve to promote a tendency to undertake actions that are appropriate in the circumstances, detailed in his book The Emotions (1986).

Question: Who published What Is An Emotion?: Classic and Contemporary Readings?
Ans: Oxford

Article: By the late 1990s, blue LEDs became widely available. They have an active region consisting of one or more InGaN quantum wells sandwiched between thicker layers of GaN, called cladding layers. By varying the relative In/Ga fraction in the InGaN quantum wells, the light emission can in theory be varied from violet to amber. Aluminium gallium nitride (AlGaN) of varying Al/Ga fraction can be used to manufacture the cladding and quantum well layers for ultraviolet LEDs, but these devices have not yet reached the level of efficiency and technological maturity of InGaN/GaN blue/green devices. If un-alloyed GaN is used in this case to form the active quantum well layers, the device will emit near-ultraviolet light with a peak wavelength centred around 365 nm. Green LEDs manufactured from the InGaN/GaN system are far more efficient and brighter than green LEDs produced with non-nitride material systems, but practical devices still exhibit efficiency too low for high-brightness applications.[citation needed]

Question: How can light emission be varied from violet to amber?
Ans: By varying the relative In/Ga fraction in the InGaN quantum wells

Article: In late September 1838, he started reading Thomas Malthus's An Essay on the Principle of Population with its statistical argument that human populations, if unrestrained, breed beyond their means and struggle to survive. Darwin related this to the struggle for existence among wildlife and botanist de Candolle's "warring of the species" in plants; he immediately envisioned "a force like a hundred thousand wedges" pushing well-adapted variations into "gaps in the economy of nature", so that the survivors would pass on their form and abilities, and unfavourable variations would be destroyed. By December 1838, he had noted a similarity between the act of breeders selecting traits and a Malthusian Nature selecting among variants thrown up by "chance" so that "every part of newly acquired structure is fully practical and perfected".

Question: Which book did Darwin begin reading in 1838?
Ans: An Essay on the Principle of Population

Article: During the 1950s the rivalry was exacerbated further when there was a controversy surrounding the transfer of Alfredo di Stefano, who finally played for Real Madrid and was key to their subsequent success. The 1960s saw the rivalry reach the European stage when they met twice in a controversial knock-out round of the European Cup, with Madrid receiving unfavourable treatment from the referee. In 2002, the European encounter between the clubs was dubbed the "Match of The Century" by Spanish media, and Madrid's win was watched by more than 500 million people.

Question: When did Barcelona meet Real Madrid twice in Europe?
Ans:
1960s