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historyarch · 2432 days ago · link · · parent · post: Doing science right: Have there been previous human civilizations on Earth?
If there was a previous society, they must not have produced plastic or chewing gum which will probably outlast the human race by billions of years.
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historyarch · 2429 days ago · link ·
I was sort of kidding, I thought adding the reference to chewing gum would make that apparent. Oh well, humor is tough to get across in a comment sometimes.