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Urine, commonly known as pee, is a waste product of our bodies that contains urea, a nitrogen-rich fertilizer used in agriculture nowadays. Although research has shown that pee can be used as fertilizer to improve crop growth, the logistics of collecting pee from every person in a city makes it impractical. Sounds very challenging. Figure 1. Artistic impression of a parallel pipe system for urine fertilizer. Luckily, there exist ways to produce big amounts of fertilizers that would save us from using our own pee.
