In 2013, a vaccine policy inadvertently launched a massive natural experiment that would offer new clues about the roots of ...

Honey bee stingers detach from the bee and continue to penetrate tissue while autonomously pumping venom. Yet the underlying mechanics have remained poorly understood. Using high-speed videography, ...

In cooperative breeding birds and mammals, some offspring give up the chance to breed independently and instead help their parents to breed. This type of cooperation involves a division of labor ...

The Cozzarelli Prize is awarded annually to six research teams whose PNAS articles have made outstanding contributions to their field. Each team represents one of the six classes of the National ...

Institutional legitimacy is essential for democracies, yet public trust and confidence in the United States Congress are at an all-time low. A significant predictor of attitudes toward Congress is ...

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 ...

As the last great ice sheets were retreating and the Pleistocene Epoch was ending, humanity began an epic journey. For hundreds of thousands of years, our ancestors had survived by hunting animals and ...

Cnidaria, the sister group of Bilateria, include corals, jellyfish, and sea anemones. They possess neurons, which are organized in a diffuse nerve net. It is generally agreed that cnidarian and ...

Dunnett et al. (1) conclude that current and predicted priority areas for wind and solar energy development (renewable energy areas, REA) overlap minimally with important conservation areas (PA) in ...

Open in Viewer Experimental protocol (A and B), meal timing effects on depression-like mood (C and D) and on anxiety-like mood (E and F), and the association of depression-like mood (G) and of anxiety ...

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 ...

The biological carbon pump (BCP) stores ∼1,700 Pg C from the atmosphere in the ocean interior, but the magnitude and direction of future changes in carbon sequestration by the BCP are uncertain. We ...