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A comment on How to build something that lasts 10k years. Parent comment

Re:How to build something that lasts 10k years by arethuza on Wednesday June 12, 2019 @05:25AM (#20163007)
Yeah - I didn't mean to suggest it was a good step - they just seem stupendously mysterious sites (I grew up fairly near one and was always fascinated by it).
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Re:How to build something that lasts 10k years by pvaldes on Wednesday June 12, 2019 @06:08AM (#20163159)
There is a simple explanation for finding vitrified rocks in a fort. Throwing lots of burning oil from the top over a rock of the correct type. They probably found some practical uses for nordic petroleum
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