they added nutrients we know are necessary, and didn't remove anything (afaict) from the soil that they don't know the effects of. They also compared it to a co

they added nutrients we know are necessary, and didn't remove anything (afaict) from the soil that they don't know the effects of. They also compared it to a control that is presumably similarly deficient to the extent possible from any place on a planet as teeming with life as Earth, and found differences they now need to explain. A thing I think people (perhaps even Very Smart People especially) don't recognize is that our understanding of nutrition-related stuff in general is just.. not actually that great? Our knowledge of what makes things grow or not grow is basically built on Easy Mode (a nitrogen rich atmosphere with billions of years of biological background in every nook and cranny). We still have a lot to learn about what it'll take in Hard Mode. And learning one hard mode environment (the moon) will probably help us learn others (mars).