of challenges posed to quantum mechanics by Albert Einstein, Boris Podolsky, and Nathan Rosen. Part II: Time and Experience Part II begins by addressing the issue that time is a very familiar concept, yet it is one of humanity's least understood concepts. Chapter 5, "The Frozen River", deals with the question, "Does time flow?" One key point in this chapter deals with special relativity. Observers moving relative to each other have different conceptions of what exists at a given moment, and hence they have different conceptions of reality. The conclusion is that time does not flow, as all things simultaneously exist at the same time. Chapter 6, "Chance and the Arrow", asks, "Does time have an arrow?" The reader discovers that the laws of physics apply moving both forward in time and backward in time. Such a law is called time-reversal symmetry. One of the major subjects of this chapter is entropy. Various analogies are given to illustrate how entropy works and its apparent paradoxes. The climax of the chapter is the co-relation between entropy and gravity, and that the beginning of the Universe must be the state of minimum entropy. In Chapters 5 and 6, time has been explained only in terms of pre-modern physics. Chapter 7, "Time and the Quantum", gives insights into time's nature in the quantum realm. Probability plays a major role in this chapter because it is an inescapable part of quantum mechanics. The double slit experiment is revisited to reveal things about the past. Many other experiments are presented in this chapter, such as the delayed-choice quantum eraser experiment. Other major issues are brought to the reader's attention, such as quantum mechanics and experience, as well as quantum mechanics and the measurement problem. Finally, this chapter addresses the important subject of decoherence and its relevance towards the macroscopic world. Part III: Spacetime and Cosmology Part III deals with the macroscopic realm of the cosmos. Chapter 8, "Of Snowflakes and Spacetime", tells the reader that the history of the universe is in fact the history of symmetry. Symmetry and its importance to cosmic evolution becomes the focus of this chapter. Again, general relativity is addressed as a stretching fabric of spacetime. Cosmology, symmetry, and the shape of space are put together in a new way. Chapter 9, "Vaporizing the Vacuum", introduces the theoretical idea of the Higgs boson. This chapter focuses on the critical first