Maybe I am not understanding this, but how is this possible.
http://www.youtube.com/watch?v=ZH96MhITOlk
Goldfish in a water tank at the bottom, with floating oil on top to help keep the fryer clean. Idea is that the stuff will float down to the tank and the goldfish will eat up the crap, but because oil is less dense than water, it floats.
But doesn't the goldfish need air to breath? Anyone can explain what this guy is saying?
Conclusion: I can only attribute this to black magic or possibly 14 century sorcery.