Book excerpt: Although Two-Thirds is in part science-based, drawing on physics and astronomy, it is also deeply philosophical in its exegesis of ideas. This book demonstrates how the secrets of our ancient structures such as the Great Pyramids in Egypt, the city of Teotihuacán in Mexico and Stonehenge in England. hold the key to the development of new energy and propulsion sources for the next millennium. Two-Thirds contains much that is not even recognised by science today, but which can be verified. We learn for example that the speed of light is not constant -- it moves at three different speeds throughout the universe. Age old mysteries are discussed ranging in topic as wide as the Moon's essential role in the creation of life on Earth, the significance of the 'Face' on Mars and the relevance of meditation.