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@DotardTed

The 19th century is when humanity made progress on electrical and petroleum engineering, as well as cooling systems. Once the necessary breakthroughs were made, all that was needed was improving, refining, and general optimization.

In the 20th century, there were millions of people educated as engineers who spent their lives optimizing the technology, which has never happened before.

I'm not knocking the alien theory, just applying Occam's razor.