Traditional chemistry textbooks present a tidy picture: Atoms in molecules occupy fixed positions, connected by rigid rods. A ...

Satellite images show that Iran has been reinforcing key military and nuclear facilities, including sites struck by the US and Israel last year, as possible war looms between Tehran and Washington.

The Navy has launched a Programmed Structural Sustainment Repair program for the dozens of F-16s acquired from the Air Force, which will allow them to fly through 2035. The U.S. Naval Air Systems ...