How big is an atomic bomb? It took a B-29 to carry the first one, dropped on Hiroshima, which may have weighed more than 10,000 Ibs. The Army’s announcement last week that it will abandon its ...

In Exercise Long Horn, the vast Army-Air Force mock war in Texas, the green-clad Aggressor forces had just seized a position deep behind the defenders’ lines and were massing for a new attack.

Physicists are uncovering the hidden rules that make certain atomic nuclei unusually stable, revealing how protons and neutrons arrange themselves in ‘magic’ configurations. New models now connect ...