Heinz-Peter Mang is obsessed with turning human waste into gold. As millions of Chinese move to cities, the German engineer is convinced the country is on the way to hitting the jackpot. A growing ...
Heinz-Peter Mang is obsessed with turning human waste into gold. As millions of Chinese move to cities, the German engineer is convinced the country is on the way to hitting the jackpot. Heinz-Peter ...
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