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iansand say: We have an analogue with the decline and fall of Rome. There is no doubt that knowledge was lost, but there is no way that the existence of Rome was concealed.
On the other hand, the first Europeans to travel down the Amazon described thriving civilisations on its banks. Decades later almost all signs of those civilisations had disappeared, presumably because of the destruction of societies by disease. Anything built was built in wood (there is little stone in the Amazon Basin) and, after people died, the structures rotted away and were lost in the jungle. It is only with modern aerial surveying techniques that the roads and earthworks associated with the civilisations have been re-discovered.
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Michael say: In my opinion a lot of it is destroyed due to certain factions that are against getting item's done in other way other's than their's & money talk's.Take the 90 day Diabete's cure. It's been sitting in the F.D.A. 's office for 6 month's now & in my opinion it will never be released to help American's. Mike
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virtualguy92107 say: A civilization that has metallurgy would be pretty hard to hide.
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Smeghead say: "Possible" is a pretty meaningless standard. It's technically possible that the entire universe popped into existence last Thursday with all of the evidence and memories to the contrary included. "Possible" isn't an interesting or useful question.
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bubba say: Narp
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megalomaniac say: It's possible, pretty much anything is possible, it just isn't very likely.
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Will say: No, because there would still be evidence on the moon and in space.
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Hogar say: We still can't figure out how huge stone blocks were moved in ancient times. Does that mean they were more advanced than us? In some ways, they were.
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ArmonuS say: no. If society had created better technology thousands of years of ago. Then there would have been some sort of proof.
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Gerard say: Maybe billions of years ago, an advanced civilization took off for Planet Oatneal after electing a Trump
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