this post was submitted on 24 Aug 2024
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They absolutely would have had prior experience if fhe process is complex. Humans tend to have bursts of developing new techniques sprinkled around, but a complex structure would be rhe result of combining existing knowledge in a new way with a few new techniques. They wouldn't figure a bunch of things out at the same time and build something to last thousands of years. They probably built similar structures that didn't hold up as well first and learned from it.
Yup. We don't have evidence of them building predecessor sites because they didn't hold up.
Or they tore them down and built newer version with better techniques!
Nope. It was aliens.