Since the turn of the 21st century, rapid advancements in phylogenomics have significantly deepened our understanding of the tree of life, particularly for ancient divergence. A recent letter to the ...

Since 2002, PNAS has offered free and immediate access to journal content for researchers in an initial group of 81 countries, a number that has grown to over 120 lower-income countries. This access ...

Cable bacteria (Desulfaobulbaceae) are known for their ability to conduct electricity in the form of negatively charged electrons over many millimeters. To determine whether cable bacteria can also ...

Maria Iandolo New, who passed away on July 26, 2024, at the age of 95, was the child of Italian immigrants who came to America as professional musicians. She grew up in the Little Italy section of ...

Edited by Anne C. Hart, Brown University, Providence, RI; received August 29, 2024; accepted December 19, 2024 by Editorial Board Member Yishi Jin ...

One glimpse at the devastation in the Los Angeles area, and it’s hard to imagine a complete rebuild. But look at the town of Paradise in northern California today, and you’d never know that the ...

A kidney cancer cell nucleus is studded with aberrant nuclear speckles (orange). Normal healthy cells tend to have the speckles clustered toward the middle. Image credit: Kate Alexander (Cold Spring ...

The rates of biological primary production before the emergence of atmospheric oxygen on Earth are thought to be low. However, mudstones from the Archean Era contain a high organic matter content, ...

Rotbarth et al. suggest that the current bimodal distribution of tree cover—dense forests (>60% cover) and sparse woodlands (<15% cover)—could transition to a more uniform “open forest” state with 30 ...

In 2010, climate scientists gathered at the Asilomar Conference Center in California, in a convening that echoed a legendary 1975 meeting in which a scientific committee came together in a exercise of ...

High-resolution measurement of Roman-era lead pollution in Arctic ice cores at the Desert Research Institute. Image credit: Jessi LeMay (Desert Research Institute, Reno, Nevada). Atmospheric lead ...

In the summer of 1977, Yosef Shiloh, then a graduate student, visited an Israeli Moroccan Jewish family with several children affected by ataxia-telangiectasia (A-T), a rare and complex genetic ...