Colloquium Abstract: Physicists invented nuclear weapons over seventy-five years ago. Today, they still threaten humanity with catastrophe and, recently, this risk has been increasing. The US has over 1,500 deployed nuclear weapons plus thousands more inactive or retired. Current policy calls for maintaining and “modernizing” about 4,000 nuclear warheads and their delivery vehicles, at the cost of […]

Colloquium Abstract  The world is in a precarious place right now and nuclear risk is higher than it has been in decades. The war in Ukraine has brought latent fears about nuclear war back to the surface. In recent years, the US has withdrawn from several arms control agreements that constrained US and Russian arsenals, […]