The researchers built a self-humidifying fuel cell stack that uses water from the cathodes to stay moist. They tested the stack, which had 10 cells, and found it could produce up to 250 watts of power. Their computer model matched the real-world results. The self-humidifying stack performed as well as regular ones and simplified the system. They also discovered that the stack works best when the gases flow in the same direction and that one cooling cell is needed for every two or three generating cells to keep the fuel cell cool.