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so a meteor hit earth 12,800, years ago, wiping out most of humanity . how long would anything we have today last over tens of thousands of years? not very long. buildings break down on a daily basis without constant maintenance. so say 1000 years, wed' see nothing
That is true, but if anyone looked they would find a shit ton of products like plastics. This particular iteration of humanity, if you like, got far enough to leave a lot of long lasting evidence behind. How long would a piece of machined titanium last? Maybe past civilizations left nothing like that behind because they just didn't make it that far.