United States Atomic Energy Commission

Edward Teller proposed a 10,000-megaton bomb in 1954. The physics allowed it — the delivery problem killed it.

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

In 1962, the US detonated a 1.4-megaton warhead 400 km above the Pacific. The sky turned green for 90 minutes.