Now, inside our anode, we need to allow H two molecules in the gas state in. And that's why we have an outside power source that allows those H two irons or H two molecules inside our anode. And to make sure our pressure is not increasing, make sure there's no build up in pressure, this needs to be released back into some outside location. That's why we have this guy on the bottom. So when this H two molecule enters our system, it is oxidized. But how is it oxidized?