Scientists are discovering the seemingly endless fuel potentials of a by-product of normal oven use.

Researchers at the California Institute of Technology are investigating whether the rust that accumulates in your oven can become a source of cheap fuel. The by-product in discussion is an oxide known as ceria, that occurs in self-cleaning ovens as they are heated. With heat, followed by its cooling down, ceria strips oxygen from water and carbon dioxide, leaving hydrogen and carbon monoxide; two elements that can be combined to make fuel.

Though scientists have understood this process for some time, they’ve only recently considered its potential as a fuel source. The result is a pure, cheap, and bountiful source of fuel that leaves scientists optimistic for the future.

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