From the Intermediate-Range Nuclear Forces Treaty to, probably, New START, all the old treaties are failing. Nuclear weapons are back in the public consciousness in a big way and old Cold War ideas that we once thought relegated to the dustbin of history are back.

One of those are so-called low yield nuclear weapons. The U.S. Navy recently fielded some of these SLBMs for the first time on its nuclear capable submarines. Are these weapons actually a game changer? When it comes to nukes, what’s the difference between yields anyway?

Here to help us figure out how much trouble we’re in is David Wright. Wright is a Senior Scientist and Co-Director of the Global Security Program at the Union of Concerned Scientists.

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