What I never could understand is how really advanced technology could be possibly be understood much less reverse-engineered.

To come to earth from some distant star, tremendously advanced technology would be needed, and it would have been developed by some form of life most likely totally different from us.

Makes fun reading but not much sense to believe in the Roswell crash...

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“He who asks a question is a fool for five minutes; he who does not ask a question remains a fool forever”
Chinese proverb
"All you need in this life is ignorance and confidence - and then success is sure." - Mark Twain.