Proceedings of the National Academy of Sciences
Articles in this Issue
Increased sea-level contribution from northwestern Greenland for models that reproduce observations
State-of-the-art ice sheet model simulations used in the Ice Sheet Model Intercomparison Project (ISMIP) that informs the Intergovernmental Panel on Climate Change tend to underestimate observed mass...
Ralph Holloway (1935–2025): Pioneering paleoneurologist
Ralph Holloway pioneered and developed the field of hominin paleoneurology. Although Holloway’s undergraduate degrees were in metallurgical engineering and geology, at graduate school his interests sw...
Collective artificial intelligence and evolutionary dynamics
Unilateral incentive alignment in two-agent stochastic games
Multiagent learning is challenging when agents face mixed-motivation interactions, where conflicts of interest arise as agents independently try to optimize their respective outcomes. Recent advanceme...
Picking strategies in games of cooperation
Evolutionary game theory (EGT) has been pivotal in the study of cooperation, offering formal models that account for how cooperation may arise in groups of selfish, but simple agents. This is done by...
European mammal turnover driven by a global rapid warming event preceding the Paleocene–Eocene Thermal Maximum
A brief global warming event known as the Pre-Onset Excursion (POE) occurred just before the Paleocene–Eocene Thermal Maximum (PETM, 56 Mya). The deconvolution of the evolutionary consequences of thes...
Perceptual interventions ameliorate statistical discrimination in learning agents
Choosing social partners is a potentially demanding task which involves paying attention to the right information while disregarding salient but possibly irrelevant features. The resultant trade-off b...
Mapping encounters between Antarctic krill fishing vessels and air-breathing krill predators using acoustic data from the fishery
Antarctic krill is a keystone species in the Antarctic marine ecosystem and the target of a growing fishery. Given the ecological importance of krill, concerns have been raised about potential negativ...
Republicans are flagged more often than Democrats for sharing misinformation on X’s Community Notes
We use crowd-sourced assessments from X’s Community Notes program to examine whether there are partisan differences in the sharing of misleading information. Unlike previous studies, misleadingness he...
An endosymbiotic origin of the crimson pigment from the lac insect
Symbioses with microorganisms expand the genetic and metabolic repertoire of many insects. The lac insect Kerria lacca (Hemiptera: Sternorrhyncha) is a phloem-f...
Heightened interest in the human X and Y chromosomes
A bittersweet relationship between the cell cycle, circadian clock, and diurnal fluctuations in taste
Global decline of apex scavengers threatens human health
Vertebrate scavengers play a critical role in ecosystem functioning worldwide. Through the cascading effects of their ecological role, scavengers can also alleviate the burden of zoonotic diseases on...
Caveolin invasion of lipid territory
Humanized mice to model rare human diseases
Abrupt shift of El Niño periodicity under CO <sub>2</sub> mitigation
Removing CO 2 from the atmosphere is emerging as a viable strategy to mitigate global warming, yet the responses of the climate system to CO...
Human influence on climate detectable in the late 19th century
The physics of the heat-trapping properties of CO 2...
Increased frequency of planetary wave resonance events over the past half-century
We demonstrate a tripling in the frequency of planetary wave resonance events over the past halfcentury, coinciding with the rise in persistent boreal summer weather extremes. This increase aligns wit...
Humans program artificial delegates to accurately solve collective-risk dilemmas but lack precision
In an era increasingly influenced by autonomous machines, it is only a matter of time before strategic individual decisions that impact collective goods will also be made virtually through the use of...
Monocytes use protrusive forces to generate migration paths in viscoelastic collagen-based extracellular matrices
Circulating monocytes are recruited to the tumor microenvironment, where they can differentiate into macrophages that mediate tumor progression. To reach the tumor microenvironment, monocytes must fir...
Siderite and ferric oxyhydroxides imply interlinked carbon, iron, and halogen cycles on Mars
Pure siderite [Fe II CO 3 ] was recently discovered in abundant quantities (4.8 to 10.5 wt.%) by the Curiosity rover at...
Collective cooperative intelligence
Cooperation at scale is critical for achieving a sustainable future for humanity. However, achieving collective, cooperative behavior—in which intelligent actors in complex environments jointly improv...