Making Oxygen on the ISS

Have you ever wondered how the International Space Station gets enough oxygen to  keep its crews breathing? It's not shipped in, at least not often. The same goes for water, although humans use a lot of oxygen and water every day. The floating laboratory is equipped with hi-tech appliances for renewing its own supplies. Water is recycled into fresh water, and some of it is used to make new oxygen. Humans also expel a lot of carbon dioxide, which is not expelled from the station, but is converted into water and methane. New water is always welcome, but this video does not go into detail on what they do with the methane. One would like to think it's expelled, because a space station fart is amusing to think about. Maybe someday it will be used as fuel. 

These conversions require separating molecules into atoms, which is amazing enough, but they've also found a way to do it with no moving parts that could break down. I'm impressed.