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You're right, taking the idea off paper and applying and building it is something completely different and more complicated.

But if 15 or even 20 years ago this type of project was being worked on and studied, today we would be much more advanced. But... the solution is to wait for the technology to be more precise and for competent people to be in charge of it.

That is the nature of technology. Most does not work out but that which does makes a different.

Apart from the other technologies that would revolutionize the world and the government finds a way to eliminate everything and then the inventor doesn't even know anything about him anymore.

At these times I remember Nikola Tesla. I know he contributed a lot to his creations, but some of his inventions mysteriously "disappeared".

Some would even help our lives today with free electricity, but the government would never let that happen, as they want people to need the state to live.

That is true. There is a lot of that by the US government. We are going to see less of it going forward.

People need to put stuff out open source so the government cant buy and control it.

Yes, it is true, as it would be a waste of many interesting and important inventions if they were not made available to the public.

They also bought up some (or just took them) and shelved them.