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Polar night

https://www.wikidata.org/wiki/Q190991

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Biology 35.4M papers	Physics 32.1M papers	Quantum mechanics 13.3M papers	Geography 11.3M papers
Geology 9.3M papers	Ecology 7.9M papers	Meteorology 2.6M papers	Astronomy 2.5M papers
Oceanography 2.4M papers		Climatology 648k papers
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Polar night 1,408 papers
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