Pnas Science Sessions

Anthony Vecchiarelli explains a system of genetic cargo movement within cells that has roots in the work of Alan Turing.

Jintai Lin explains the impact of a global economy on air pollution in China and in the US.

Frank Bates describes how a project related to chewing gum led to materials science discoveries.

Abigail Marsh describes mechanisms of altruistic kidney donors' responsiveness to others' emotions.

Robert Epstein of the American Institute for Behavioral Research describes how search engine rankings can influence voter preferences.

Seth Burgess describes a timeline of events surrounding the end-Permian mass extinction.

Yaara Oren and Tal Pupko describe how bacteria can evolve via transfer of gene regulatory regions.

Noam Sobel explains how a human olfactory fingerprint helps uncover the uniqueness of individuals’ sense of smell.

Rino Rappuoli of GlaxoSmithKline discusses preclinical studies of a vaccine candidate against Staphylococcus aureus.

As AAAS president for 2015, Geraldine Richmond focuses on global scientific engagement.

Susan Fiske describes how intentional acts of harm motivate people to assign blame.

Jef Boeke explains how to safeguard against unauthorized growth of engineered microorganisms.

Lonnie Thompson discusses clues to Earth's ancient climate history that are stored in tropical glacial ice.

Kyle Siler discusses the role of editors as gatekeepers at scientific journals.

Alán Aspuru-Guzik discusses how he uses supercomputing as a "molecular spaceship" to explore chemical space and discover potentially useful new molecules.

Keith Joung and Feng Zhang explain methods for editing sequences of DNA in living cells.

Veronica Vieland discusses a common disconnect between scientists and statisticians in evaluating scientific evidence.

Robin Ali describes efforts to transplant healthy rod and cone cells into afflicted retinas.

Hesham Sadek explains the regenerative capability of newborn mouse hearts.

Ambassador Deborah Birx discusses international efforts in the fight against HIV/AIDS.