Every time you ask for feedback, I hesitate to post this. You're very passionate about these ideas, and I know it's been a lifelong quest. I'm not doing this to be discouraging. I just know what it's like to put stuff out there and hear mostly crickets (if that's what's happening for you). I'm completely unqualified to comment in any meaningful way on your ideas. I'm hoping that hearing something is better than hearing nothing. We test our mental models by exposing them to the world and taking in feedback. What we do with that feedback is entirely up to us. So, in the spirit of trying to honor your request for input... A) I think you need to be submitting your ideas to people qualified to understand, evaluate, discuss, promote, and/or extend them. For example... https://summit.aps.org/, https://en.wikipedia.org/wiki/List_of_physics_conferences, https://www.iop.org/physics-community/iop-conferences, https://internationalconferencealerts.com/usa/physics B) I agree that most people don't really care about flying cars, hoverboards, or floating cities. I would want an application that solves a current problem or meets a current need. A flying car is essentially a plane or helicopter, and would be subject to the same laws and regulations about where you could go. Other than maybe some highly-constrained fun, I don't see how it would improve my life. I couldn't fly to Paris for the weekend and land on the street without being arrested for crossing the border illegally. I couldn't fly to work without violating the city airspace rules. A floating city would have all the problems of every other city, except way more (like access to water, electricity, food, dealing with waste management, exposure to threats from below, and high altitude sickness and increased UV exposure for the people).