Iran presented the U.S. and other world powers with a new proposal for resolving the standoff over its nuclear program on Tuesday in Geneva. How close is Iran to building a nuclear weapon?

Outrider.org is an activist group made up of scientists and experts who hope ... Needless to say, it can be a pretty scary thing to simulate a nuclear bomb dropping on your hometown, but that ...

How close were the Nazis to developing an atomic bomb? The truth is that National ... the physicist Werner Heisenberg had calculated that nuclear fission chain reactions might be possible.

The United States has fast-tracked production of one of the most powerful nuclear weapons in its arsenal to date, the B61-13 gravity bomb — a weapon so potent it boasts a yield 24 times ... Driving ...

The Soviets developed and tested their own bomb in 1949. The world’s nuclear arsenal now stands at about 27,000 bombs. Receive a weekly dose of discovery in your inbox! We'll also keep you up to ...