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RE: Top 4 Brilliantly Novel Uses of Concrete, Concrete, and More Concrete (Notes from Under the Tatami Mats–16 … My Adventures in Japan)
'Sand Wars', a documentary about the aggregrate industry, reveals that around 40% of the aggregrate used in concrete is mined illegally by the 'sand mafia'.
Might be why concrete moguls are so connected to government. Government is mostly gangsters, IMHO.