Question: For maximum life, capacitors usually need to be able to handle the maximum amount of reversal that a system will experience. An AC circuit will experience 100% voltage reversal, while under-damped DC circuits will experience less than 100%. Reversal creates excess electric fields in the dielectric, causes excess heating of both the dielectric and the conductors, and can dramatically shorten the life expectancy of the capacitor. Reversal ratings will often affect the design considerations for the capacitor, from the choice of dielectric materials and voltage ratings to the types of internal connections used.
Is there an answer to this question:  What does voltage reversal never create in the dielectric of a capacitor?

Answer: unanswerable


Question: In 1565, the powerful Rinbung princes were overthrown by one of their own ministers, Karma Tseten who styled himself as the Tsangpa, "the one of Tsang", and established his base of power at Shigatse. The second successor of this first Tsang king, Karma Phuntsok Namgyal, took control of the whole of Central Tibet (Ü-Tsang), reigning from 1611–1621. Despite this, the leaders of Lhasa still claimed their allegiance to the Phagmodru as well as the Gelug, while the Ü-Tsang king allied with the Karmapa. Tensions rose between the nationalistic Ü-Tsang ruler and the Mongols who safeguarded their Mongol Dalai Lama in Lhasa. The fourth Dalai Lama refused to give an audience to the Ü-Tsang king, which sparked a conflict as the latter began assaulting Gelug monasteries. Chen writes of the speculation over the fourth Dalai Lama's mysterious death and the plot of the Ü-Tsang king to have him murdered for "cursing" him with illness, although Chen writes that the murder was most likely the result of a feudal power struggle. In 1618, only two years after Yonten Gyatso died, the Gelug and the Karma Kargyu went to war, the Karma Kargyu supported by the secular Ü-Tsang king. The Ü-Tsang ruler had a large number of Gelugpa lamas killed, occupied their monasteries at Drepung and Sera, and outlawed any attempts to find another Dalai Lama. In 1621, the Ü-Tsang king died and was succeeded by his young son Karma Tenkyong, an event which stymied the war effort as the latter accepted the six-year-old Lozang Gyatso as the new Dalai Lama. Despite the new Dalai Lama's diplomatic efforts to maintain friendly relations with the new Ü-Tsang ruler, Sonam Rapten (1595–1657), the Dalai Lama's chief steward and treasurer at Drepung, made efforts to overthrow the Ü-Tsang king, which led to another conflict. In 1633, the Gelugpas and several thousand Mongol adherents defeated the Ü-Tsang king's troops near Lhasa before a peaceful negotiation was settled. Goldstein writes that in this the "Mongols were again playing a significant role in Tibetan affairs, this time as the military arm of the Dalai Lama."
Is there an answer to this question: Who refused an audience with the Ü-Tsang king?

Answer: The fourth Dalai Lama


Question: A videoconference system is generally higher cost than a videophone and deploys greater capabilities. A videoconference (also known as a videoteleconference) allows two or more locations to communicate via live, simultaneous two-way video and audio transmissions. This is often accomplished by the use of a multipoint control unit (a centralized distribution and call management system) or by a similar non-centralized multipoint capability embedded in each videoconferencing unit. Again, technology improvements have circumvented traditional definitions by allowing multiple party videoconferencing via web-based applications.
Is there an answer to this question: What is a video-conference also known as?

Answer: videoteleconference


Question: Canada has the world's largest deposit of natural bitumen in the Athabasca oil sands and Canadian First Nations along the Athabasca River had long used it to waterproof their canoes. In 1719, a Cree Indian named Wa-Pa-Su brought a sample for trade to Henry Kelsey of the Hudson’s Bay Company, who was the first recorded European to see it. However, it wasn't until 1787 that fur trader and explorer Alexander MacKenzie saw the Athabasca oil sands and said, "At about 24 miles from the fork (of the Athabasca and Clearwater Rivers) are some bituminous fountains into which a pole of 20 feet long may be inserted without the least resistance."
Is there an answer to this question: In what year did Athabasca see the oil sands? 

Answer:
unanswerable