Perhaps you don't talk about passing gas all day long with everyone that you know (what's wrong with you?!). But let's be honest, we all do it and it's sort of fascinating in the weird way that all bodily functions are. That came out of there? Weird. Gas is made up of a few different gasses: hydrogen, nitrogen, oxygen, carbon dioxide, sulfur dioxide, and sometimes methane. Gas comes from a breakdown of food in your digestive system by all the nice bacteria that we have working hard in there. How much gas we have and how noticeable it is can be highly variable depending on a lot of factors like of course what we're putting into our body and pretty much every living organism goes through it. It just never really stops once it starts. But as totally normal and common as it is, there are probably a lot of things that you don't know about it. Here are some weird and cool facts you didn't know about passing gas.