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Contributed by M. Brian Maple, July 3, 2018 (sent for review April 23, 2018; reviewed by Filip Ronning and Brian C. Sales) ...

The COVID-19 pandemic provided a natural experiment to test the impacts of human activity on urban-dwelling wildlife. Urban dark-eyed juncos differ in bill shape and size in Los Angeles in comparison ...

Coral reef fish may be more important than we thought ...

Assessing the ergodicity of graphene liquid cell electron microscope measurements, we report that loop states of circular DNA interconvert reversibly and that loop numbers follow the Boltzmann ...

Counterfeit judgments in large language models Get full access to this article Purchase, subscribe, or recommend this article to your librarian.

A common denominator: PTSD, rapid eye movements, and fear extinction ...

Social media are often said to exacerbate polarization by platforming hostility between groups. However, positive social emotions like ingroup solidarity may also drive social media engagement, ...

We are updating our policy regarding the availability of data, with an emphasis on visual data, effective January 1, 2024. Image credit: François Parcy. PNAS strives to promote and endorse best ...

The PNAS journals have recently updated their authorship and editorial policies for PNAS and PNAS Nexus to address the use of generative AI tools, such as ChatGPT, in producing research reports. In ...

Computational modeling has become a valuable tool for science and policy, but community standards to share model details have not kept pace. For research to be replicated, evaluated, and improved, ...

Open in Viewer RoBMA PSMA model-averaged posterior mean effect size estimates with 95% credible intervals and Bayes factors for the absence of the effect for the combined sample or split by either the ...