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.

How do you close the gap between I wonder and I know? You make a prototype. A prototype is a tool that gives you a chance to investigate your ideas and explore what could, should, or would come next, ...

Radian Aerospace’s subscale prototype for its Radian One space plane sits on a runway in the United Arab Emirates. (Radian Aerospace Photo) Seattle-based Radian Aerospace has finished the first round ...

Tesla has been spotted testing a Model 3 prototype with what appears to be a new camera setup. Is Tesla preparing a new vision rig for its next vehicles? While most other companies working on ...

At the PARI Hypersonics Advanced Manufacturing Technology Center (HAMTC), from left: Nate Humbert, lead additive manufacturing engineer, GE Additive; Will DeVerter, aeronautics and astronautics ...

Donut Lab battery validation adds a 10-day room-temperature retention figure of 97.7%, while energy density and weight data remain absent.

A new Audi prototype is spotted during testing at the Nürburgring, hinting at an upcoming performance model. The camouflaged ...

U.K.-based electric vertical takeoff and landing (eVTOL) air taxi manufacturer Vertical Aerospace is back to testing aircraft. The manufacturer has begun ground testing a new, more advanced full-scale ...

A late-night testing session in Los Angeles turned into a roadside rescue for the highly anticipated Rivian R2 prototype.

CNN investigates: Video appears to contradict Trump’s claim that deadly strike on girls’ school was ‘done by Iran’ Doctor adopts boy who came to surgery alone, then finds homes for his 5 siblings ...