think piece
think piece {n.}, {slang}
1. The human brain.
Lou's got one powerful think piece, man.
2. Any provocative essay or article that, by stating a strong opinion, arouses the reader to think about it and react to it by agreeing or disagreeing.
That article by Charles Fenyvesi on Vietnamese refugees in the Washington Post sure was a think piece!
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Source: A Dictionary of American Idioms