At New Scientist last week, science writer and editor George Musser talked about the way a theory of consciousness that sees the brain as a quantum system is now under reluctant consideration. Musser, author of Putting Ourselves Back in the Equation (Farrar, Straus and Giroux, 2023) went to visit anesthesiologist Stuart Hameroff, who — with theoretical physicist Roger Penrose — advances the quantum-based Orch Or Theory (orchestrated objective reduction of the quantum state). Do quantum phenomena...