At the Edge of Time is a startling new addition to the body of literature called reality theory. Donald W. Jarrell contends that there are two realities, one a virtual reality of our time-and-space world and a second reality beyond time and space. Many philosophers and physicists agree that time is only an illusion. The author takes this idea one important step forward, using findings of quantum mechanics and neuroimaging to show that both time and space are illusions, that what we experience as time and space is a virtual reality. As with the hypotheses of dark energy and dark matter, it is not possible to de nitively prove or disprove that we live in a dual-reality world. The laws of physics prevent this. However, again as with dark energy and dark matter, we know we live in a dual-reality world by observing its effects on our world. If the dual-reality theory is correct, it should serve to explain our world in ways that allow us to understand, to change, and to accurately predict events. The theory has been used in At the Edge of Time to provide new ways to understand phenomena which are opaque or not fully explainable using other theories. These include wave function collapse, the holographic universe, the many-worlds interpretation, the delayed-choice experiment, particles in superposition, the space-traveling-twin saga, time, Bell's theorem, and gravity. These understandings and their predictions are subject to testing by experiment. At the Edge of Time challenges the reader to understand and to navigate the world in a remarkably new and ful lling way."