"Research brings traditional sustainable building material into 21st century"
https://phys.org/news/2018-12-traditional-sustainable-material-21st-century.html?fbclid=IwAR3pruzqHSmZxbkmQ_Kpj9sXNkbCFl8uFppYqTqDwIcy4R4isySnth_bef0
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