Huge ancient city found in the Amazon
The city was built 2,500 years ago but may have been abandoned after a volcanic eruption.
Source: bbc.com
Why Roman Concrete Endured Thousands of Years of Seawater Pounding, While Ours Can't - ExtremeTech: Roman concrete's durability
Why Roman Concrete Endured Thousands of Years of Seawater Pounding, While Ours Can't - ExtremeTech: Roman concrete's durability and strength blows our own out of the water (in this case, literally). And after years of research, we're getting better at understanding why. It seems that the sea water may...
Source: extremetech.com
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