In her new book, “The Ideological Brain,” the neuroscientist Leor Zmigrod outlines what makes some people prone to rigid thinking.

© Tom Jamieson for The New York Times

Rescuers rushing to the scene of Israeli airstrikes save those who they can, but are forced to leave many behind. “My soul is tired from this war,” one said.

Adopting even just one of these easy strategies can make a meaningful difference in how you feel and function.