Question: The major applications of copper are in electrical wires (60%), roofing and plumbing (20%) and industrial machinery (15%). Copper is mostly used as a pure metal, but when a higher hardness is required it is combined with other elements to make an alloy (5% of total use) such as brass and bronze. A small part of copper supply is used in production of compounds for nutritional supplements and fungicides in agriculture. Machining of copper is possible, although it is usually necessary to use an alloy for intricate parts to get good machinability characteristics.
Is there an answer to this question: What property does combining copper with brass or bronze eliminate?

Answer: unanswerable

Question: 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.
Is there an answer to this question: Who colonized Brazil?

Answer: Pedro Alvares Cabral

Question: Elizabeth's personal fortune has been the subject of speculation for many years. Jock Colville, who was her former private secretary and a director of her bank, Coutts, estimated her wealth in 1971 at 2 million (equivalent to about 25 million today). In 1993, Buckingham Palace called estimates of 100 million "grossly overstated". She inherited an estimated 70 million estate from her mother in 2002. The Sunday Times Rich List 2015 estimated her private wealth at 340 million, making her the 302nd richest person in the UK.
Is there an answer to this question: What did the Sunday Times estimate Elizabeth's fortune to be in 2015?

Answer: 340 million

Question: In May 2014, prior to the launch of YouTube's subscription-based Music Key service, the independent music trade organization Worldwide Independent Network alleged that YouTube was using non-negotiable contracts with independent labels that were "undervalued" in comparison to other streaming services, and that YouTube would block all music content from labels who do not reach a deal to be included on the paid service. In a statement to the Financial Times in June 2014, Robert Kyncl confirmed that YouTube would block the content of labels who do not negotiate deals to be included in the paid service "to ensure that all content on the platform is governed by its new contractual terms." Stating that 90% of labels had reached deals, he went on to say that "while we wish that we had [a] 100% success rate, we understand that is not likely an achievable goal and therefore it is our responsibility to our users and the industry to launch the enhanced music experience." The Financial Times later reported that YouTube had reached an aggregate deal with Merlin Networka trade group representing over 20,000 independent labels, for their inclusion in the service. However, YouTube itself has not confirmed the deal.
Is there an answer to this question: What reason did Robert Kyncl give in May 2014 for YouTube blocking content labels?

Answer:
unanswerable