From the celebrated author of the best-selling Physics for Future Presidents comes “a provocative, strongly argued book on the fundamental nature of time” (

“Now” is a simple yet elusive concept. You are reading the word “now” right now. But what does that mean? What makes the ephemeral moment “now” so s

The notion that fundamental equations governing the motions of physical systems are invariant under the time reversal transformation (T) has been an important,

Why is the future so different from the past? Why does the past affect the future and not the other way around? What does quantum mechanics really tell us about