1944: Weapons-grade plutonium, for the very heart of the Fat Man atomic bomb used to obliterate Nagasaki, Japan, is first produced at the Hanford Nuclear Reservation in south-central Washington state. Twenty-seven years later, in 1971, the Atomic Energy Commission detonates the largest U.S. underground hydrogen device, during testing in Alaska’s Aleutian Islands.
The development of weapons-grade [...]