QUES: Hazards to aircraft include debris, nesting birds, and reduced friction levels due to environmental conditions such as ice, snow, or rain. Part of runway maintenance is airfield rubber removal which helps maintain friction levels. The fields must be kept clear of debris using cleaning equipment so that loose material does not become a projectile and enter an engine duct (see foreign object damage). In adverse weather conditions, ice and snow clearing equipment can be used to improve traction on the landing strip. For waiting aircraft, equipment is used to spray special deicing fluids on the wings.
Why must the field be kept clear of nesting birds?

ANS: unanswerable

QUES: Aside from the 20th century addition of the Bois de Boulogne, Bois de Vincennes and Paris heliport, Paris' administrative limits have remained unchanged since 1860. The Seine departement had been governing Paris and its suburbs since its creation in 1790, but the rising suburban population had made it difficult to govern as a unique entity. This problem was 'resolved' when its parent "District de la region parisienne" (Paris region) was reorganised into several new departments from 1968: Paris became a department in itself, and the administration of its suburbs was divided between the three departments surrounding it. The Paris region was renamed "Ile-de-France" in 1977, but the "Paris region" name is still commonly used today. Paris was reunited with its suburbs on January 1, 2016 when the Metropole du Grand Paris came into existence.
When was the Siene department created?

ANS: 1790

QUES: Child labour has been a consistent struggle for children in Brazil ever since the country was colonized on April 22, 1550 by Pedro Alvares Cabral. Work that many children took part in was not always visible, legal, or paid. Free or slave labour was a common occurrence for many youths and was a part of their everyday lives as they grew into adulthood. Yet due to there being no clear definition of how to classify what a child or youth is, there has been little historical documentation of child labour during the colonial period. Due to this lack of documentation, it is hard to determine just how many children were used for what kinds of work before the nineteenth century. The first documentation of child labour in Brazil occurred during the time of indigenous societies and slave labour where it was found that children were forcibly working on tasks that exceeded their emotional and physical limits. Armando Dias, for example, died in November 1913 whilst still very young, a victim of an electric shock when entering the textile industry where he worked. Boys and girls were victims of industrial accidents on a daily basis.
When was Brazil colonized?

ANS: April 22, 1550

QUES: Behavior that may be optimal for an individual (e.g., saving more during adverse economic conditions) can be detrimental if too many individuals pursue the same behavior, as ultimately one person's consumption is another person's income. Too many consumers attempting to save (or pay down debt) simultaneously is called the paradox of thrift and can cause or deepen a recession. Economist Hyman Minsky also described a "paradox of deleveraging" as financial institutions that have too much leverage (debt relative to equity) cannot all de-leverage simultaneously without significant declines in the value of their assets.
What is it called when too many consumers attempt to save or pay down debt at the same time?

ANS:
paradox of thrift