I wrote an ode to Physics; I narrate the romance with it; I confide how I think about it; I confess my thirst for complete knowledge of its laws; I agonize over when its end will come!

Trying to understand how the physical world works, I dedicated half of my academic career to research. The other half I devoted to teaching, communication, and dissemination of what I learned. When I started, three decades ago, I was taught that we were one step away from the end of Physics, a breath away from the Theory of Everything. Today, we are even further from the "thread" we were ready to "cut" thirty years ago. 

Everything we know today about Physics resembles an island surrounded by the ocean of the unexplored. The physicist's mind is ignited when realizing how much there is still to learn. I did not write this book to narrate the evolution of Physics, nor to envision its future (since I do not know it and suspect that the road will be long). I wrote it because I want to talk to you about what I know we do not know. I invite you on an insatiable intellectual journey, with stops at the three "pillars" of modern physics: relativity, quantum mechanics, and thermodynamics. And at the end of the journey, the mystery of invisible matter, dark energy, loop quantum gravity, M-theory, and grand unification. 

What more do you need to feel awe and admiration? But, is it possible for someone not to love Physics?