Mutations have been studied through three levels of investigation: (1) their original discovery and proof of inheritance according to Mendelian principles; (2) the artificial production of them by radiation and mutagenic chemicals and parallel with this work, the study of their actual behavior in natural populations; and (3) the molecular genetic approach. In spite of great enthusiasm and many claims, no investigator has shown as yet that any mutation is so advantageous as to spread through an entire species population of plants or animals. Molecular geneticists, such as Seymour Benzer, conclude, “in the DNA of living organisms, typographical errors are never funny and are often fatal.” The technique used by Benzer in analyzing T4 bacteriophage virus mutations is described, and it is shown that all mutations in this phage are either deletions of varying length, nucleotide base changes, or addition or loss of a base. When either an addition or loss of a base occurs the remainder of the code becomes a nonsense code and the combination is non-functional. Molecular genetics shows the DNA code to be a marvelously complex one. Surely in studying it we are coming close to understanding how God is daily at work maintaining and preserving all creatures.