question:You are an AI assistant. You will be given a task. You must generate a detailed and long answer. Solar energy: In the last two decades, photovoltaics (PV), also known as solar PV, has evolved from a pure niche market of small scale applications towards becoming a mainstream electricity source. A solar cell is a device that converts light directly into electricity using the photoelectric effect. The first solar cell was constructed by Charles Fritts in the 1880s. In 1931 a German engineer, Dr Bruno Lange, developed a photo cell using silver selenide in place of copper oxide. Although the prototype selenium cells converted less than 1% of incident light into electricity, both Ernst Werner von Siemens and James Clerk Maxwell recognized the importance of this discovery. Following the work of Russell Ohl in the 1940s, researchers Gerald Pearson, Calvin Fuller and Daryl Chapin created the crystalline silicon solar cell in 1954. These early solar cells cost 286 USD/watt and reached efficiencies of 4.5–6%. By 2012 available efficiencies exceed 20% and the maximum efficiency of research photovoltaics is over 40%. Please answer a question about this article. If the question is unanswerable, say "unanswerable". In what year was the crystalline silicon solar cell constructed?

question:You are an AI assistant. You will be given a task. You must generate a detailed and long answer. Darren Wilson was just one of 53 officers in a small-town police department until his encounter with an 18-year-old August 9 on a street in Ferguson, Missouri. "He was a gentle, quiet man," Police Chief Thomas Jackson said Friday, referring to Wilson. "He was a distinguished officer. He was a gentleman. ... He is, he has been, an excellent officer." Authorities, citing death threats, had until Friday refused to release Wilson's name after he fatally shot Michael Brown. A resident of the St. Louis area, Wilson, 28, has been staying at a secure location since the shooting. It was not known whether Wilson -- an officer for six years, including four in Ferguson -- had been placed on modified assignment. Jackson told reporters the officer had faced no disciplinary action during his time on the job. Wilson lives in a neighborhood of modest homes about 20 miles from Ferguson. Neighbors, who seemed angry and worried about the sudden attention on their quiet community, were reluctant to talk about Wilson. Several said the officer left his home days ago. Brown was African-American; Wilson is white. One of Wilson's friends, Jake Shepard, said he couldn't imagine the officer killing somebody. "I can say -- without speaking to Darren, without even having heard his statements -- that, at that moment in time, he was scared for his life," Shepard said. "I am 100% positive of that because I could never imagine him even in that situation -- taking someone's life, let alone taking someone's life with malicious intent. He's just the last person on Earth that you would think to do something like that. It's just shocking. Based on the article and the following list of answers, write a list of questions. 1. Michael Brown 2. African-American 3. unknown 4. shot 5. Darren Wilson 6. officer 7. six years 8. Ferguson 9. four years 10. 28

question:You are an AI assistant. User will you give you a task. Your goal is to complete the task as faithfully as you can. While performing the task think step-by-step and justify your steps. Translate the following. English: I am very grateful to all those persons who have given me words of encouragement; those who have not abandoned me in this struggle for truth and justice; those who work to knock down the wall of silence that surrounds the terrorist actions perpetrated against Cuba; the Cuban Five, who infiltrated the Miami mafia groupings and risked their lives, their families and their happiness to try to prevent the commission of terrorist actions like the one that severed the life of my son. I feel grateful to the Government and the Communist Party of Cuba, the Cuban Institute of Friendship with the Peoples, the Cuban-Italy Friendship Association, La Villeta, the Comitato Fabio Di Celmo and all other institutions that both in Cuba as well as in Italy have supported me in this endeavor. Spanish:

question:You are an AI assistant. Provide a detailed answer so user don’t need to search outside to understand the answer. Bailey worked at night and went to the store early in the morning. Given that the answer to a question is "busy", what is the question? A: