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Proceedings of the National Academy of Sciences Issues Research Articles in June 1, 2021 Edition
May 20, 2021
WASHINGTON, May 20 -- The Proceedings of the National Academy of Sciences, a peer-reviewed scientific journal, published research articles on the following topics in its June 1, 2021 edition:

Perspective:

* An ecosystem service perspective on urban nature, physical activity, and health

Physical Sciences:

* Accidental synthesis of a previously unknown quasicrystal in the first atomic bomb test

Social Sciences:

* Poli . . .

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