Proceedings of the National Academy of Sciences of the United States of America

• 1. Introduction

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  Proceedings of the National Academy of Sciences of the United States of America has been landing on the desks of researchers since 1915. Known almost universally by its abbreviation PNAS, it carries the distinction of being the second most cited scientific journal in the world, accumulating more than 1.9 million citations in the decade between 2008 and 2018. That figure alone raises a question: how does a single journal become a crossroads for so many different fields of science? And what happens when the institution behind it makes choices that put public safety in direct conflict with open inquiry?

• 2. An Academy Finds Its Voice

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  The National Academy of Sciences was founded in 1863, chartered by the United States Congress with a mandate to investigate, examine, experiment, and report upon any subject of science or art. For its first several decades, the Academy published only three volumes of organizational transactions, documents that consisted mostly of meeting minutes and annual reports. That changed in 1914, when the NAS established PNAS, with the first issue appearing in 1915. The journal's earliest managing editor was Edwin Bidwell Wilson, a mathematician whose appointment signaled the cross-disciplinary ambitions that would define the publication. For much of its early history, the journal focused on brief first announcements of research by Academy members and their associates, a narrow circle that would eventually widen.

• 3. Opening the Gates

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  Until December 1995, getting a paper into PNAS required sponsorship from a member of the National Academy of Sciences. That year, the journal opened submissions to all authors without that prerequisite. Even before that change, members could communicate up to two papers from non-members each year, with referees selected by the sponsoring member and their identities kept anonymous from the authors. The tension between that insider review model and standard peer review practices would not fully resolve quietly. Today, ninety-five percent of papers go through direct peer-reviewed submission, while five percent are contributed submissions. In 2022, the NAS extended its publishing footprint by establishing PNAS Nexus, an interdisciplinary open-access journal published by Oxford Academic.

• 4. Science, Security, and Botulinum Toxin

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  In 2003, PNAS issued an editorial laying out its policy on sensitive material in the life sciences, pledging to monitor submitted papers for content that could compromise public welfare. The pledge was tested almost immediately. In 2005, the journal published a paper titled "Analyzing a bioterror attack on the food supply: The case of botulinum toxin in milk", printing it despite direct objections from the U.S. Department of Health and Human Services. The paper did not appear alone. Bruce Alberts, who was president of the Academy at the time, contributed a commentary alongside it under the title "Modeling attacks on the food supply". That paired publication framed a charged editorial decision as an act of institutional transparency rather than recklessness.

• 5. The Pal Review Problem

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  A 2023 review by Holliday et al. examined the Younger Dryas impact hypothesis, a theory the authors characterized as having evolved from pseudoscience and as forming the basis for the pseudoarchaeology seen in Graham Hancock's Ancient Apocalypse. The hypothesis had first entered the scientific record through PNAS, using what the review described as a nonstandard review process. Holliday et al. wrote that claiming evidence where none exists and providing misleading citations, when conducted repeatedly, becomes negligent and undermines scientific advancement as well as the credibility of science itself. They identified the journal's contributed review system for National Academy members as at least partially responsible, noting that what some called "pal reviews" were significantly curtailed in 2010, in part because of the controversy surrounding that hypothesis. The episode left a documented mark on how the journal handles the privileges of membership.

• 6. Reach and Access

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  With a 2024 impact factor of 8.9 according to Journal Citation Reports, PNAS sits near the top of the scientific publishing hierarchy. US local newspapers have called it prestigious, renowned, and high impact, phrases that reflect the journal's unusual visibility outside specialist circles. Since January 2019, PNAS has operated as an online-only publication, though print issues remain available on demand. Researchers seeking immediate open access can pay an author fee to bypass the standard six-month embargo. Since September 2017, articles published under that open-access route have carried Creative Commons licenses, a legal structure that governs how freely others can share and build on the work.