The authoritative guide to ensuring science and technology make life on Earth better, not worse.

Hans Kristensen

A growing nuclear debate: The risk of calling everything a nuclear threat

By Chloe Shrager | Nuclear Weapons

Decision to keep nuclear weapons data classified hurts US national security

By Heather Wuest | Analysis, Interviews, Nuclear Notebook, Nuclear Risk

Watch the 2025 Doomsday Clock announcement on January 28