Evolution is a fact. The evidence for it is simply overwhelming. However, the original mechanism that generates the evolutionary process, as first put forth simultaneously by Charles Darwin and Alfred R. Wallace and which became known as Natural Selection, has now been seen to be too simplistic by some scientists aside from hard-core neo-Darwinists, who insist that nothing whatsoever is wrong with the original, classical, theory. This book examines in detail the flaws in the original mechanism and puts forth an alternate theory based heavily on the work of Nobel Prize laureate Barbara McClintock. At its basis, the present theory postulates that it is extraterrestrial impacts, with the occasionally resulting volcanism, that is the generating power for speciation. Whereas the classical theory postulated that evolutionary change was brought about by the individual organism, this theory claims that evolution is imposed on the organism.