Can we say when, where, and how the colours we see are formed? Are colours present like the flowers in a garden, or just an appearance? A simple, surprising fact,  The Unified Principle of Colour , brings answers to age-old questions about colour and colour relationships. To the physics of light, and the biology of vision, a third discipline is added: the process of consciousness that enables perception. It shows that the observer, a living being, has an essential role in producing the colours we perceive.

Scattering of light by light is a fundamental process arising at the quantum level through vacuum fluctuations. This short book will explain how, remarkably enough, this quantum process can entirely be described in terms classical quantities. This description is derived from general principles, such as causality, unitarity, Lorentz, and gauge symmetries. The reader will be introduced into a rigorous formulation of these fundamental concepts, as well as their physical interpretation and applications.

    Popular myth has it that Albert Einstein originated the concept of "space-time". However, not only did Einstein not originate the idea of "space-time", he vigorously opposed it for quite some space of time.  In fact, space-time theories have been quite common in folk-lore, philosophy, mathematics, religion,  science, science fiction,  psychology,  and are even inherent in some languages.     Contrary to popular myth, Einstein did not usher in the atomic age. In fact, he found the idea of atomic energy ...

The book is an introduction to the subject of fluid mechanics, essential for students and researchers in many branches of science. It illustrates its fundamental principles with a variety of examples drawn mainly from astrophysics and geophysics as well as from everyday experience. Prior familiarity with basic thermodynamics and vector calculus is assumed.

In the world about us, the past is distinctly different from the future. More precisely, we say that the processes going on in the world about us are asymmetric in time, or display an arrow of time. Yet this manifest fact of our experience is particularly difficult to explain in terms of the fundamental laws of physics. Newton's laws, quantum mechanics, electro-magnetism, Einstein's theory of gravity, etc., make no distinction between past and future -- they are time-symmetric. Reconciliation of these profoundly conflicting facts is the topic of this volume. ...