4 ms·

… but seriously, this astonished me. Would love to see the rough calculation behind this. My biochemistry isn’t nearly good enough to begin to replicate this

• voxadam 5y ago
  Regardless of the biochem possibilities I wonder about the engineering realities required to collect, isolate, purify, and distribute the urea and other nitrogen rich compounds from the waste stream.
• PeterisP 5y ago
  On a theoretical level, all these fertilizers get added just so the soil doesn't get depleted by what gets driven away to the field and eaten by city-dwelling humans, so it kind of makes sense that they get delivered to our bodies and then expelled.