What I thought and what I know now are two different things now. One thing of interest I always found fun is Who has been covering this up.
(Lockheed Martin) Is the biggest players here first of all, Where scandal starts in misappropriated government funds. When the sports model flying saucer crashed in Roswell Lockheed Martin got most of the debris. This is where I think most importantly we got "smart silicon". but more importantly Learned how to form silicon nano particles within a certain unique structure into amorphous Crystal silicon. Then come Opto electronics and photonics.
Nanostructures have a distinct morphology for enhancing surface area and optical properties. This is how they make light. Production conditions have to be perfect, we get LEDS and solar cells from this technology also biometric unique optical characteristics