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The arrival of which comet in 1986 was met by a series of American, Soviet, Japanese, and ESA probes?
The right answer is: Halley's Comet
The arrival of Halley's Comet in 1986 was met by a series of American, Soviet, Japanese, and ESA probes.
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History
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Which long-running show flopped in its 1975 premiere?
1960s
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Which river caught on fire multiple times in 1969, which resulted in the Clean Water Act, Great Lakes Water Quality Agreement, and the creation of the federal Environmental Protection Agency?