Chinese fighter jet mid-flight before airshow - Alert5/Wikimedia Commons/CC BY-SA 4.0 The roots of the jet engine can be traced back to before World War II, and they generally still work on the same ...

Rim-driven thrusters turn the normal propeller-motor arrangement inside out; rather than mounting the motor at the center of the propeller, they use a large hollow motor, with the blades attached to ...

As the United States marks its 250th anniversary, WTOP presents “250 Years of America,” a multipart series examining the innovations, breakthroughs and pivotal moments that have shaped the nation ...