Culture is a powerful force that touches all aspects of human life, from health and reproduction to food and clothing technology, in every known human population around the world. Human cultural ...

Artist’s reconstruction: During the Early Cretaceous Period in northeastern China, a parent Psittacosaurus cares for nestlings in a burrow and senses the presence of a predatory mammal, Repenomamus.

Edited by Eva Andrei, Rutgers The State University of New Jersey, Piscataway, NJ; received March 14, 2024; accepted August 13, 2024 Part of the challenge in pinpointing the dominant origin of RTN is ...

Cliffs of brown North Mountain Basalt atop latest Triassic-age white and red lacustrine strata of the Fundy Basin, outcropping along the north shore of the Bay of Fundy at Five Islands Provincial Park ...

The scientific innovation enterprise supporting United States research and development (R&D) has undergone a significant shift in institutional alignment over the past 20 years. This shift has seen ...

laflunimus 7.2 ± 3.7 2.5 Concentration that produces 50% inhibition. Lowest concentration of statistically significant inhibition. LIC is antisickling for cells from 2 of 3 donors. Compound causes ...

Edited by Éva Kondorosi, Hungarian Academy of Sciences, Biological Research Centre, Szeged, Hungary; received March 26, 2024; accepted October 7, 2024 ...

As loss of biodiversity and ecosystem degradation become major concerns worldwide, scientists increasingly depend on DNA-based characterization of animal communities for monitoring and impact ...

A subscription to PNAS provides seamless access to the latest research published daily online and in weekly issues. Active subscribers can access all published content, including the full text of any ...

When Carl Linnaeus invented binomial nomenclature in the 18th century, it provided a universal language for scientists. Giving each species a unique name is essential for effective communication, ...

Edited by Mark Thiemens, University of California San Diego, La Jolla, CA; received June 19, 2024; accepted September 5, 2024 ...

Invasive plants can have strong, cascading effects on recipient ecosystems. Using a functional trait framework has been useful in understanding the mechanisms underlying these invasion impacts.