What most people don't know is that Harry Truman was on the verge of authorizing the dropping of a third nuclear device on Japan. What stopped him? His legacy. He correctly saw that a third bomb would all but destroy his reputation in the history books. 

And this: Klaus Fuchs was a naturalized British physicist who worked on the Atom bomb project in the US and later in the UK. It was later discovered that Fuchs handed over just about all the theory and construction details of the A-Bomb to the Russians. Thus, Fuchs is the only scientist who was involved in the building of Atomic bombs in 3 countries. Fuchs also shares a US patent, 5292-X.,  (the X means that this patent is still classified) with Janos Von Neumann, the great Hungarian physicist. Von Neumann is generally given credit for inventing the modern computer. His architecture is used in all smartphones as well. And, the patent? It's a device for triggering a Hydrogen Bomb