As the cloud cleared, Air Force bombers dropped in to gather air samples. Researchers hoped that the radioactive fallout ...

Abstract: With the rapid advancement of space exploration technology, the use of intelligent equipment and systems is increasing at an accelerated pace. As the core component of intelligent systems, ...

All 67 people on board the plane and the helicopter were killed. An American Airlines regional jet went down in the Potomac River near Washington, D.C.'s Ronald Reagan Washington National Airport ...

Officers said driver who hit the victim called 911, provided information, and then drove away. After the initial hit, the man ...