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.

Mike Gil discusses how changes in animal behavior can affect ecosystems.

Brad Greenwood explains how patient–physician racial concordance decreases Black infant mortality.

Vinay Pathak describes when and where HIV sheds its capsid coating while infecting human cells.

Jeannie Lee describes the discovery of self-cleaving ribozymes.

Josh Bongard describes AI-designed, reconfigurable biological organisms made from frog cells.

Jonathon Yuly, David Beratan, and Peng Zhang investigate how electron bifurcation reactions work.

Adam Mastroianni and Daniel Gilbert explore why conversations almost never end when people want them to.