Next month it will have been 80 years since the Japanese cities of Hiroshima and Nagasaki were devastated by nuclear attacks.

Find out just how close the Nazis came to building atomic weapons during World War II, and view the only known diagram of a German nuclear bomb.

The two atomic bombs were resulted in the death of about 246,000 people and left behind a trail of unimaginable destruction. ... a more compact size, and lower mass, ...

The bomb had in fact yielded 20 kilotons, making it about the same size as Trinity, the first U.S. atomic test. Two months later the scientists principally responsible for designing the bomb won ...