@efa2e20e @cc043a5b Don't forget gravity engines, as exotic & complex they are to make, do appear to work. Big military airplane makers already have research patents in this area.

Star Trek derives from 1950s Forbidden Planet movie. Which itself is a 50s Sci-Fi retelling of Shakespeare's The Tempest.

Many of its tech predictions came true b/c Gene's cousin worked at The Rand Corporation (US military Research & Development Inc), it's Think Tank experts played futurist for him for free. 

 @e7fa5e63 link please to gravity engines that work in OUR reality!? 

 @efa2e20e do a patent search for Boeing or  Lockheed and gravitic or electrogravitic lift. 

 @e7fa5e63 

Yeah, I see https://en.wikipedia.org/wiki/United_States_gravity_control_propulsion_research

But no working results still