The Bulletin of the Atomic Scientists’ Doomsday Clock is now set to 89 seconds — the closest to midnight yet. So why is this hopeful? Daniel Holz, chair of the Bulletin’s Science and Security Board, joins host Krys Boyd to discuss the many factors that go into the Doomsday Clock calculations and why determining how close we are to disaster is an exercise in our capacity to change for the better. Learn about your ad choices: dovetail.prx.org/ad-choices