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A capacitor (originally known as a condenser) is a passive two-terminal electrical component used to store electrical energy temporarily in an electric field. The forms of practical capacitors vary widely, but all contain at least two electrical conductors (plates) separated by a dielectric (i.e. an insulator that can store energy by becoming polarized). The conductors can be thin films, foils or sintered beads of metal or conductive electrolyte, etc. The nonconducting dielectric acts to increase the capacitor's charge capacity. Materials commonly used as dielectrics include glass, ceramic, plastic film, air, vacuum, paper, mica, and oxide layers. Capacitors are widely used as parts of electrical circuits in many common electrical devices. Unlike a resistor, an ideal capacitor does not dissipate energy. Instead, a capacitor stores energy in the form of an electrostatic field between its plates.
How many electrical conductors, or plates, do all capacitors contain at a minimum?
A: two electrical conductors

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Providing 25% of Namibia's revenue, mining is the single most important contributor to the economy. Namibia is the fourth largest exporter of non-fuel minerals in Africa and the world's fourth largest producer of uranium. There has been significant investment in uranium mining and Namibia is set to become the largest exporter of uranium by 2015. Rich alluvial diamond deposits make Namibia a primary source for gem-quality diamonds. While Namibia is known predominantly for its gem diamond and uranium deposits, a number of other minerals are extracted industrially such as lead, tungsten, gold, tin, fluorspar, manganese, marble, copper and zinc. There are offshore gas deposits in the Atlantic Ocean that are planned to be extracted in the future. According to "The Diamond Investigation", a book about the global diamond market, from 1978, De Beers, the largest diamond company, bought most of the Namibian diamonds, and would continue to do so, because "whatever government eventually comes to power they will need this revenue to survive".
Where does Namibia rank in the exportation of uranium? 
A: fourth

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The end of World War II set the stage for the East–West confrontation known as the Cold War. With the outbreak of the Korean War, concerns over the defense of Western Europe rose. Two corps, V and VII, were reactivated under Seventh United States Army in 1950 and American strength in Europe rose from one division to four. Hundreds of thousands of U.S. troops remained stationed in West Germany, with others in Belgium, the Netherlands and the United Kingdom, until the 1990s in anticipation of a possible Soviet attack.
With the outbreak of which war did concerns for the defense of Western Europe decrease?
A: unanswerable

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Like much of the southeastern United States, Raleigh has a humid subtropical climate (Köppen Cfa), with four distinct seasons. Winters are short and generally cool, with a January daily average of 41.0 °F (5.0 °C). On average, there are 69 nights per year that drop to or below freezing, and only 2.7 days that fail to rise above freezing. April is the driest month, with an average of 2.91 inches (73.9 mm) of precipitation. Precipitation is well distributed around the year, with a slight maximum between July and September; on average, July is the wettest month, owing to generally frequent, sometimes heavy, showers and thunderstorms. Summers are hot and humid, with a daily average in July of 80.0 °F (26.7 °C). There are 48 days per year with highs at or above 90 °F (32 °C). Autumn is similar to spring overall but has fewer days of rainfall. Extremes in temperature have ranged from −9 °F (−23 °C) on January 21, 1985 up to 105 °F (41 °C), most recently on July 8, 2012.
How many nights in a year are there in Raleigh that are freezing?
A:
69 nights per year