PONCE INLET, Fla. -- The U.S. Navy set off a massive explosion in the Atlantic Ocean on Friday as part of a test to ensure a new aircraft carrier is hardened to withstand battle conditions. The blast ...

The 1996 Comprehensive Nuclear Test Ban Treaty (CTBT) has not yet entered into force due to the failure of eight key states, including the United States and China, to ratify it and Russia’s decision ...