I believe there's a real good chance the government has some kind of anti-gravity, as well as many other revolutionary technologies that would blow us away. However, I really don't give a rat's ass. Why? By the time they make it available to the general public, I'll probably be 90 years old (or long dead). If I can't see it myself, use it myself, or even know for sure that it exists, why the heck should I care?