noun: sterile offspring of a male donkey and a female horse
Schauberger
Crude oils belong to the genus of physical manifestations that are incapable of reproduction. They are formations that missed their way on evolution's developmental path and rightly belong to the genus of mules, in which connection the donkey is also known to have made a mess of the normal progress of development. Seen from this angle, distilled crude oil is to be considered as a kind of super-mule, produced by humans who think they can cleverly outsmart Nature. [The Energy Evolution - Harnessing Free Energy from Nature, The Liquefaction of Coal by Means of Cold Flows]