cerebellum) or the "new brain" (cerebrum). The old brain controls more primitive processes, having to do with basic survival, such as breathing, eating, and reproduction, whereas the new brain manages more advanced personal and social issues, such as territorial conflicts, separation conflicts, and self-devaluation and identity conflicts. Hamer's research is tied to the science of embryology because he links the type of disease progression—whether involving tissue augmentation (tumor growth), tissue loss (necrosis or ulceration), or functional impairment—with the embryonic germ layer (endoderm, mesoderm or ectoderm) from which both the organ tissues and the corresponding brain regions originate. Conflicts which have their focus either in the brain stem (which controls body tissues that derive from the endoderm) or the cerebellum (which controls tissues that derive from the mesoderm) show cell multiplication in the conflict active phase, and destruction of the resulting tumors in the healing phase. Cerebrum directed conflicts (affecting the rest of mesoderm-derived tissues and all ectoderm-derived ones) show either cell decrease (necroses, ulcers) or function impairment or interruption in the active phase, and the replenishment of the damaged tissues in the healing phase (which can also be diagnosed as a tumor). 4th law (Ontogenetic system of microbes): Microbes do not cause diseases but are used by the body, coordinated by the brain, to optimize the healing phase, provided that the required microbes are available when needed. Fungi and mycobacteria work on tissues that originated in the endoderm, as well as on some of the tissues originating in the mesoderm. Bacteria work on all mesoderm-derived tissues and viruses on ectoderm-derived ones. Hamer maintains that these microbes, rather than being antagonistic to the body, actually perform a necessary role in healing, and that some of the interventions of conventional medicine are counterproductive, by interfering with these natural processes. 5th law ("Quintessence"): The conflict active phase and the healing phase of diseases, as described above, constitute "special meaningful programs of nature," developed during the evolution of the species, to allow organisms to override everyday functioning in order to deal with particular emergency situations. Therefore, according to Hamer, no real diseases exist; rather, what established medicine calls a "disease" is actually a "special meaningful program of nature" (sinnvolles biologisches Sonderprogramm) to which bacteria, viruses and fungi belong. Hamer's GNM claims to explain every disease and treatment according to those premises, and to thereby obviate traditional medicine. The cure is always the resolving of