Nickie
25-10-2018, 15:01
Urea, sand and bacteria solidify at room temperature without the need for high-temperature kilns.
More... (https://www.bbc.co.uk/news/world-africa-45978942)
More... (https://www.bbc.co.uk/news/world-africa-45978942)
View Full Version : Human urine bricks invented by South African students