Computer Cooler By Mineral Oil Submerged

A mineral oil is any of various colorless, odorless, light mixtures of alkanes in the C15 to C40 range from a non-vegetable (mineral) source, particularly a distillate of petroleum.

The name mineral oil by itself is imprecise, having been used to label many specific oils over the past few centuries. Other names, similarly imprecise, include white oil, liquid paraffin, and liquid petroleum.
Source: Wikipedia

Here you'll watch a computer without cooler fans but it's cooled by a mineral oil it's really amazing and incredible.