Question: Calls are used for a variety of purposes, including mate attraction, evaluation of potential mates, bond formation, the claiming and maintenance of territories, the identification of other individuals (such as when parents look for chicks in colonies or when mates reunite at the start of breeding season), and the warning of other birds of potential predators, sometimes with specific information about the nature of the threat. Some birds also use mechanical sounds for auditory communication. The Coenocorypha snipes of New Zealand drive air through their feathers, woodpeckers drum territorially, and palm cockatoos use tools to drum.
Is there an answer to this question: What do birds use for evaluation of potential mates and mate attraction?

Answer: Calls


Question: Operating at normal power line frequencies, universal motors are often found in a range less than 1000 watts. Universal motors also formed the basis of the traditional railway traction motor in electric railways. In this application, the use of AC to power a motor originally designed to run on DC would lead to efficiency losses due to eddy current heating of their magnetic components, particularly the motor field pole-pieces that, for DC, would have used solid (un-laminated) iron and they are now rarely used.
Is there an answer to this question: What were universal motor pole pieces constructed from?

Answer: solid (un-laminated) iron


Question: England first appeared at the 1950 FIFA World Cup and have appeared in 14 FIFA World Cups, they are tied for sixth-best in terms of number of wins alongside France and Spain. The national team is one of eight national teams to have won at least one FIFA World Cup title. The England team won their first and only World Cup title in 1966. The tournament was played on home soil and England defeated Germany 4–2 in the final. In 1990, England finished in fourth place, losing 2–1 to host nation Italy in the third place play-off after losing on penalties to champions Germany in the semi-final. The team has also reached the quarter-final on two recent occasions in 2002 and 2006. Previously, they reached this stage in 1954, 1962, 1970 and 1986.
Is there an answer to this question: Where was the 2002 World Cup held?

Answer: unanswerable


Question: In the latter half of his career Hayek made a number of contributions to social and political philosophy, which he based on his views on the limits of human knowledge, and the idea of spontaneous order in social institutions. He argues in favour of a society organised around a market order, in which the apparatus of state is employed almost (though not entirely) exclusively to enforce the legal order (consisting of abstract rules, and not particular commands) necessary for a market of free individuals to function. These ideas were informed by a moral philosophy derived from epistemological concerns regarding the inherent limits of human knowledge. Hayek argued that his ideal individualistic, free-market polity would be self-regulating to such a degree that it would be 'a society which does not depend for its functioning on our finding good men for running it'.
Is there an answer to this question: What is the responsibility of government in Hayek's market order?

Answer:
to enforce the legal order