Though they were not permitted to talk to anyone about their work, including each other, by 1945 some had figured out that they were in fact building an atomic bomb.

In the past century, the American military reported "broken arrows" multiple times. Some of the atomic bombs lost years ago ... the B-47 was to be refueled in mid-air twice. The second refueling ...

Leaflets dropped on cities in Japan warning civilians about the atomic bomb, dropped c. August 6, 1945. Aftermath of the August 6, 1945 Atomic Bomb blast in Hiroshima, 1946. Library of Congress ...

Over the years, many atomic bomb survivors (hibakusha ... Three-quarters of a century later, we must ask what we’ve learned from the mushroom cloud that swelled above this city in 1945 ...

As World War II raged, scientists gathered beneath the football stands at the University of Chicago to work on an experiment that would radically reshape the 20th century ... the first test of the ...