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Henry M. Morris (1918-2006) was one of the foremost biblical creationists of the late 20th century; he was also the author/coauthor of books such as The Genesis Flood the Biblical Record and Its Scientific Implications, The Scientific Case for Creation, Scientific Creationism, What Is Creation Science?, etc. He wrote in the Preface to this 1967 book, "The Christian school movement ... should be supported by Christian people to the greatest extent possible... However, it is a painfully realistic fact that not more than a minute fraction of the world's youth... can ever be taught in a genuinely Christian and creationistic school system. We need urgently to reach the host of others with literature which will in some way open their minds and hearts to the true Biblical cosmology. This small book has been prepared with this one need in mind." Here are some additional quotations from the book: "Mutations definitely do occur, and they are definitely hereditable, entering into the genetic pool with other Mendelian characteristics. And it does seem reasonable that, if a particular mutant character turns out to be favorable and to make its possessor better qualified to compete in the surrounding environment in the struggle for existence, it would have a real 'survival value.' Perhaps, then, over the ages an accumulation of such favorable mutations preserved by natural selection might result in a new, better-equipped 'kind' of organism." (Pg. 27) "As a matter of fact, it is quite reasonable to say that some---perhaps all---of the radiogenic lead was in the mineral right from the beginning. If one admits the necessity---or even the possibility---of real CREATION, then the creation of all substances in equilibrium in a fully-completed, functioning universe is completely plausible." (Pg. 52) "It seems not at all unlikely, therefore, that certain amounts of lead (in all its isotopes), as well as other elements in the present decay chain. -- Amazon.com