Opinions expressed by Entrepreneur contributors are their own. Amazon Fire Phone, Google Glass, New Coke and Nintendo’s Virtual Boy: What do all these products have in common? They didn’t sell.

The U.S. Air Force and Northrop Grumman are working to establish a new baseline for the LGM-35A Sentinel intercontinental ballistic missile program after a major cost overrun review, with a ...

A full-scale electrically heated prototype of the Department of Energy’s (DOE’s) 100-kWth MARVEL nuclear microreactor has been successfully installed at a facility in New Freedom, Pennsylvania, and is ...

Vertical Aerospace expects to complete its second VX4 prototype “in the coming weeks”, leading to the restart of its flight-test programme in the second quarter. UK-based start-up Vertical has already ...

Such is not the case with Overair's Butterfly, however, the just-unveiled prototype of which should soon begin flight testing. To recap our previous coverage, the Butterfly is an eVTOL (electric ...