QUOTE : Dark matter is currently thought to make up about 23 percent of the mass and energy of the universe, whereas normal matter and energy make up only about 4 percent. Worse still, most contemporary cosmologists think that the continuing expansion of the universe is driven by “dark energy,” whose nature is again obscure. According to the Standard Model of cosmology, dark energy currently accounts for about 73 percent of the matter and energy of the universe. How do dark matter and energy relate to regular matter and energy? And what is the zero-point energy field, also known as the quantum vacuum? Can any of this zero-point energy be tapped? The law of conservation of matter and energy was formulated before these questions arose, and has no ready answer for them. It is based on philosophical and theological theories. Historically, it is rooted in the atomistic school of philosophy in ancient Greece. From the outset it was an assumption. In its modern form, it combines a series of “laws” that have developed since the seventeenth century—the laws of conservation of matter, mass, motion, force and energy. In this chapter I look at the history of these ideas, and show how modern physics throws up questions that the old theories cannot answer. As faith in conservation comes into question, astonishing new possibilities open up in realms ranging from the generation of energy to human nutrition.