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Originally Posted by Topspinmo
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It's just one of many historical mysteries---besides, was Puma Punku built in 200 AD or 17,000 BC??? Maybe, since we don't build with carved stone, we lost that skill. How much more removed from building with stone would aliens capable of interstellar travel be???
There was an episode of Stargate where essentially computer chips called replicators were conquering the galaxy and our very advanced alien allies were losing since all their weapons were energy/particle beam based and the replicants were immune. It took our primitive machine guns to defeat them, something the more advanced allies would never have thought of. I just have my doubts that any aliens would travel to Earth just to play Lego with 100 ton stones in Peru.