Problem: "What lip-syncing duo had the hit ""Blame it on the Rain""?"
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A: milli vanilli

Problem: Who wrote the 1884 novel 'The Adventures of Huckleberry Finn'?
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A: mark twain

Problem: YM. 'Life of Pi' won the Man Booker Prize for Fiction in 2002. Who is the author?
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A: yann martel

Problem: What is a navigation instrument used until the 18th century to measure the angles between heavenly bodies, or between them and the horizon?
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A:
astrolabe