I once saw a detailed analysis, written a few years after WWII, that showed in great detail that every technology needed to build a V2 missile was in existence by 1910. But, the V2 didn't go into operation until the 1940s and development started more than 10 years earlier.
Now we have the laser as an example of another technology that could have been invented 30 to 40 years earlier. But, in fact, neither of them was invented earlier.
The point is that first you have to imagine that something is possible, and that goes beyond just having a theoretical proof of the possibility. Then you have to believe that it is possible. But, even that is not enough. You have to have someone who was exposed to the knowledge required to invent the thing who has the belief and who has access and understanding of the precursor technologies.
Then, that person, or persons, has to have the will and the resources needed to finally build a working model.
After that comes the hard part. The hard part is convincing people that what you have done is something new and valuable. In the case of the V2 the large holes that appeared in the European landscape were plenty of proof. In the case of the laser the poor guy couldn't even get his paper announcing his invention published because the people doing peer review didn't understand what he said.
The challenge is to go out and identify research that actually points to world changing new technology. If you can do that, then you are a genius and you will be doing a huge service for humanity.
Stonewolf