[Q]: Sentence: The cultural centers of the Greeks have included Athens, Thessalonica, Alexandria, Smyrna, and Constantinople at various periods. Question: Where have the centers of culture been located for the Grecian world historically ?
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[A]: yes

[Q]: Sentence: Also relevant is the Zeigarnik effect which states that people remember uncompleted or interrupted tasks better than completed ones. Question: What is the Zeigarnik effect?
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[A]: yes

[Q]: Sentence: Ken Tucker of Entertainment Weekly considered that "As TV, American Idol is crazily entertaining; as music, it's dust-mote inconsequential". Question: Which publication did Tucker work for?
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[A]:
yes