Here is a question about this article: The International Organization for Standardization has established a number of standards relating to solar energy equipment. For example, ISO 9050 relates to glass in building while ISO 10217 relates to the materials used in solar water heaters.
What is the answer to this question: What is the name of the standard related to the materials used in solar water heaters?
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So... ISO 10217


Here is a question about this article: In mid-2004 Madonna embarked on the Re-Invention World Tour in the U.S., Canada, and Europe. It became the highest-grossing tour of 2004, earning around $120 million and became the subject of her documentary I'm Going to Tell You a Secret. In November 2004, she was inducted into the UK Music Hall of Fame as one of its five founding members, along with The Beatles, Elvis Presley, Bob Marley, and U2. In January 2005, Madonna performed a cover version of the John Lennon song "Imagine" at Tsunami Aid. She also performed at the Live 8 benefit concert in London in July 2005.
What is the answer to this question: HOw much did the tour earn?
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So... around $120 million


Here is a question about this article: With the unification of the Anglo-Saxon kingdoms (outside the Danelaw) by Alfred the Great in the later 9th century, the language of government and literature became standardised around the West Saxon dialect (Early West Saxon). Alfred advocated education in English alongside Latin, and had many works translated into the English language; some of them, such as Pope Gregory I's treatise Pastoral Care, appear to have been translated by Alfred himself. In Old English, typical of the development of literature, poetry arose before prose, but King Alfred the Great (871 to 901) chiefly inspired the growth of prose.
What is the answer to this question: When did Alfred the Great's reign begin?
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So...
871