I was recently doing some thinking about the relation between fossil fuels and organisms. First of all, how do scientists know for sure that fossil fuels are derived from prehistoric life? Do they assume this because fossil fuels are made of organic compounds and therefore must have come from organic beings? Is it possible that reservoirs of so-called fossil fuels were really the result of completely geological or astrophysical processes? And perhaps the first complex organic compounds came from the "simple" organic compounds contained in pools of fossil fuel? If we admit this as a possibility, it would put a dent in the perplexity about how complex bio-chemical molecules were "created", I believe.