I've thought of it, the obvious thing to change the world. But when I explain it, ppl just get all negative and say "sure, it seems easy but you're not an engineer so you can't know.",(reply>), To be fair, if you are attempting to replace something that has trillions of computer hours of simulations backing it up you need to have something more solid than logic.<br><br>Also, anyone who doesn't explain WHY something would be unfeasible doesn't deserve to say anything, engineer or not. For example too costly, too hard to implement, too expensive to implement, ect.<br><br><br>On the other side of things, some people say stuff like "Why don't we just make the front wheels of a car smaller so its always going downhill and you dont need an engine" <br><br>The fact you haven't mentioned your idea could go either way, a small piece of hidden genius... or someone who doesn't know how physics works.