The cost of this book is only that which it costs for production. In MERCURY, SULPHUR AND SALT, Oliver Cohen explores his theory about the nature of true reality, the inter-connected realm of everything and the proof that God exists, although maybe not the idea of God you grew up with! Cohen sets a blue print for what he hopes is an understanding so great and so primordial that when understood will create a spiritual revolution for the betterment of humankind. Merging science with religious belief this small book may just be the catalyst for something great.