The best way to do that is with a separating toilet. Human urine is rich in nitrogen and phosphorus. But many other mammals, amphibians and fish make urea as well. Chemical also can be an adjective to describe properties of materials that are the result of various reactions between different compounds.

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One process produces crystals of magnesium-ammonium phosphate. Methods already existed to make fertilizer from urine. To be useful, the process must make money, Pradhan explains.

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The researchers will continue to work on these fertilizers to see whether they contain any potentially harmful contaminants. People who work in this field are known as environmental scientists.

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And that will let a lot of valuable nutrients go to waste — literally. In a new study, students wore wrist activity trackers that pinpointed when they fell asleep and woke up.

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Now researchers in Finland have a new way to pull them out of human pee. Plants need these nutrients to grow. These materials often are capable of eating away at some minerals such as carbonate, or preventing their formation in the first place.