PNAS Science Sessions

Researchers explore how and when humans first arrived in the Americas.

L. Mahadevan, Petur Bryde, and Suraj Shankar explain the otherworldly sounds of the musical saw.

Guido Friebel discusses the lack of gender parity in academic positions in economics.

Christianne Corbett and Robb Willer explore perceptions of electability of female political candidates.

A feature episode explores recent developments and future research directions in treating cystic fibrosis.

Martijn van de Pol reports that approximately half of the changes in the traits of 60 European bird species can be attributed to rising mean temperatures.

Brenhin Keller and Kalin McDannell explore the origins of a worldwide gap in the geologic record spanning hundreds of millions to billions of years.

Neda Maghbouleh, Ariela Schachter, and René Flores explore the US Census classification of people with Middle Eastern and North African ancestry.

Thema Monroe-White and Cassidy Sugimoto discuss how disparities at the intersection of race and gender affect the expansion of scientific knowledge.

Researchers explore cutting-edge approaches to coral reef conservation. Image credit: Cody Engelsma (Mote Marine Laboratory, Sarasota, FL).

Researchers explore cutting-edge approaches to coral reef conservation. Image credit: Cody Engelsma (Mote Marine Laboratory, Sarasota, FL).

Ray Block Jr. and John Holbein report that Americans are more likely to respond to an emailed survey request from a sender with a putatively White name than a sender with a putatively Black name. Image credit: iStock/Prostock-Studio.

A collection of research articles explores how tropical ecosystems have borne the brunt of the human impact on the environment. Image credit: Pixabay/Pexels.

A collection of research articles explores how tropical ecosystems have borne the brunt of the human impact on the environment. Image credit: Pixabay/Pexels.

A special episode explores the state of CRISPR use in agriculture. Image credit: Can Stock Photo/molekuul.

A special episode explores the state of CRISPR use in agriculture. Image credit: Can Stock Photo/molekuul.

Rodrigo Cámara-Leret explains the impact of indigenous language extinction on medicinal plant knowledge. Image credit: Pixabay/DEZALB.

Nicolas Taberlet and Nicolas Plihon explore the physical explanation for a fascinating natural phenomenon: the formation of Zen stones on frozen lakes. Image credit: N. Taberlet, N. Plihon. Lab Physique ENS de Lyon and CNRS.

Hessam Azarijafari, Randy Kirchain, and Jeremy Gregory explore how innovations in the concrete industry can reduce greenhouse gas emissions. Image credit: Pexels/Life Of Pix.

Sarah Chambliss discusses racial and ethnic disparities in exposure to air pollutants. Image credit: Pixabay/sueegeneris.

Maggie Wagner and Manuel Kleiner report that the interaction between maize and soil microbes influences hybrid vigor. Image credit: Kayla M. Clouse.

Gaige Kerr discusses racial disparities in atmospheric levels of nitrogen dioxide in the United States.

Stephanie Marciniak, Logan Kistler, and Ed Louis describe an extinct giant lemur.

Mohammad Reza Alizadeh, John T. Abatzoglou, and Mojtaba Sadegh report that forest fires have been advancing upslope across the western United States in recent decades.

Eran Amichai investigates how bats know the speed of sound.