Theoretically Anti-gravity could become a reality in the next 2 decades.
We can make some reasonable assumptions about how gravity and anti-gravity works, we've got a planet that spins 1 rotation a day to create our gravity. You can swing a bucket of water with little or no effort to create gravity.
This comparison shows that effort on a big object like the earth requires a huge amount of kenetic energy to create our gravity, but in relation a very simple bucket of water takes only a little elbow grease.
Now every action has an opposite reaction using the same amount of effort. If this holds true creating anti-gravity for a spinning bucket becomes somewhat easy (stop the bucket from spinning what happens?). I know stoping a bucket of water does not create anti-gravity. But it's an opposite reaction which counter-acts or cancels out the gravitational pull of the spinning bucket.
Gravity is caused by the earth spinning on it's axis while generating a magnetic field, put opposite ends of a magnet near each other; they jump away. So in theory if you were to take opposite poles of a magnet and arrange it in to a star, take another set of magnets and create a star with oposite poles, arrange it like a cogg, what do you get when they spin? Anti-Gravity, try to control this is very hard, it could cause serious trouble if you attempt this and not have a method to control it, you could create a giant telsa coil if you're not careful.
Now I know most of this sounds like bullshit, and I admit I do watch a lot of star trek, but what if I'm right? What if I've got a theory that could solve the worlds energy shortage and create a new industry to power every aspect of our lives?
Maybe I'm a dreamer, maybe I'm a inventor, or maybe just maybe I've taken you all on a tour of pure bullshit so believable, you've entered the Twighlight zone.
Welcome to my world.