A pair of researchers at Rockefeller University has identified "resource-driven" selection as a purifying selective force that can be connected to environmental nutrient availability. In their paper published in the journal Science, Liat Shenhav and David Zeevi describe their study of the genetic factors at play as organisms are optimized to face environmental challenges. Martin Polz and Otto Cordero with the University of Vienna and MIT, respectively, have published a Perspective piece in the same journal issue outlining the work by the team in New York.