"...Lewin is a perfectionist; he has a maniacal obsession with detail. Isn't he just the world's leading physics professor? He pioneered the field of X-ray astronomy and for two decades constructed, controlled, and observed subatomic and astronomical phenomena with highly sensitive instruments, specially designed to observe X-rays with exceptional precision. By launching huge research balloons into the upper layers of the Earth's atmosphere, he began to reveal an exotic world full of astronomical phenomena, such as X-ray flashes. The discoveries, both his own and those of his collaborators, demystified the death of stars during massive supernova explosions and confirmed the existence of black holes. [...]

""You changed my life" is the common title in the emails that Lewin receives daily from every corner of the planet. Steve, a florist in San Diego, wrote: "I now have wings on my feet and see life through the eyes of physics." Mohammed, a student at a preparatory engineering school in Tunisia, wrote: "In my country, unfortunately, teachers cannot see any beauty in physics, and I suffer because of it. They only want us to learn how to solve some typical physics exercises to pass exams. They cannot see beyond this narrow horizon." Seyed, an Iranian who has earned postgraduate degrees from American universities, writes: "I never truly enjoyed life until I attended your classes.
Professor, you have truly changed my life. The way you teach physics is worth ten times the tuition, and you make other teachers look like criminals. It is a MAJOR CRIME to teach poorly." Siddharth, from India, wrote: "I was able to feel physics beyond its equations. Your students will always remember you like I do: as an exceptional teacher who made life and learning more interesting than I thought they could be."

"Mohammed, excited about the last classical mechanics lesson, wrote approvingly that he was impressed by the phrase: "Perhaps you will always remember from my lessons that physics is exciting and beautiful and that it is everywhere around you, every moment, only if you have learned to discover it and appreciate its beauty." Marjorie, another admirer, wrote: "I attend your classes as often as I can - often five times a week. I am thrilled by your personality, your sense of humor, and, above all, your ability to simplify things. I hated physics in high school, but you made me love it." Lewin receives dozens of such emails every week and responds to all of them. [...]

"Since he first stepped up to the lectern to teach, more than half a century ago, Lewin has been "taking his students to the moon." Constantly fascinated by the beauty and mystery of the natural world - from the rainbow to neutron stars, from a mouse's femur to musical sounds - and captivated by the scientist's and artist's endeavor to explain, interpret, and represent this world, Walter Lewin is one of the most passionate, dedicated, and capable scientific guides of our time.
In the book, you will be able to experience Lewin's passion, dedication, and ability as he reveals his boundless love for physics and shares it with you. Enjoy the journey!"

Warren Goldstein, from the Introduction of the book