Sara Imari Walker
Astrobiologist and Theoretical Physicist, Arizona State University

Sara Walker is an astrobiologist and theoretical physicist at Arizona State University, where she is Deputy Director of the Beyond Center for Fundamental Concepts in Science, Associate Director of the ASU-Santa Fe Institute Center for Biosocial Complex Systems, and Associate Professor in the School of Earth and Space Exploration.

Written by Sara Imari Walker

Detail of White Cat (1935-38), by Gertrude Abercrombie. Courtesy the Smithsonian American Art Museum

Life ≠ alive

A cat is alive, a sofa is not: that much we know. But a sofa is also part of life. Information theory tells us why

Michael Lachmann & Sara Walker