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By peeing (no kidding!)

Actually I've heard that people were researching ways to get people's pee to use in fertilizers. Nitrogen and phosphorus are good fertilizers and are both present in pee, but the global price of those elements is skyrocketing: if we get people's pee, we get cheap fertilizer!

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12y ago
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Q: What food nutrient does nitrogenous waste come from?
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