Concrete made from human urine may sound unusual but this is a research project at the University of Stuttgart.
Campers at a travel fair have donated litres of their urine in a bid to help build more sustainable structures in future.
Researchers at the University of Stuttgart are using their urine to develop a kind of concrete that does not require cement and should be significantly more climate-friendly.
Donating not flushing
"We build on urine" was what scientists wrote on a display at the CMT travel trade fair to promote donations.
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