The deadly crash in the Potomac after an American Eagle jet collided with a military helicopter has stirred memories of a long-ago tragedy in Washington, D.C. An Air Florida flight taking off en route ...
As more space junk is falling to Earth uncontrolled, scientists are using seismometers to track the debris.
A high-tech sensor designed and built at the Lawrence Livermore National Laboratory (LLNL) has now traveled farther than 250 ...