Comprehensive Nuclear-Test-Ban Treaty

Nine states. Two thousand detonations. Why a nuclear test is often a sentence in a conversation, not a lab result.

Three credible sources, three different numbers — and the gap isn't new explosions. It's what each one decided to count.

From Sedan's 104-kiloton crater to a plan for 520 bombs in the Negev — how the atomic age tried to become civil engineering.