Lots of green energy experiments in the lab publish impressive results—but what’s more impressive is when those results come from an actual on-site pilot demonstration in the real world. That’s the case with new research that is able to generate ammonia out of thin air, without requiring an external power source.This technique was developed by a team of researchers from Stanford University and King Fahd University of Petroleum and Minerals in Saudi Arabia. It relies on a fine mesh coated with ca...