QED: The strange theory of light and matter

Celebrated for his brilliantly quirky insights into the physical world, Nobel laureate Richard Feynman also possessed an extraordinary talent for explaining difficult concepts to the general public. Here Feynman provides a classic and definitive introduction to QED (namely quantum electrodynamics), that part of quantum field theory describing the interactions of light with charged particles. Using everyday language, spatial concepts, visualizations, and his renowned "Feynman diagrams" instead of advanced mathematics, Feynman clearly and humorously communicates both the substance and spirit of QED to the layperson. A. Zee's new introduction places both Feynman's book and his seminal contribution to QED in historical context and further highlights Feynman's uniquely appealing and illuminating style.

Feynman writes not so much to surprise (which he certainly does) but with a passionate desire that we the readers follow what he is saying. This is a book for those who are curious as to what makes the world tick, even if they already have some knowledge of the quantum world. I did not find this an easy read (the concepts are too alien) but it was most rewarding.

Feynman writes not so much to surprise (which he certainly does) but with a passionate desire that we the readers follow what he is saying. This is a book for those who are curious as to what makes the world tick, even if they already have some knowledge of the quantum world. I did not find this an easy read (the concepts are too alien) but it was most rewarding.

I found this book an inspiration later when trying to convey some electromagnetic ideas to someone without the math background. The diagramming techniques work well. Without Feynman and this book I may have given up. But if he can explain QED to mere mortals, certainly more of us can convey difficult concepts (far less difficult than QED) to educated adults.

Richard Feynman possessed some kind of special brand of genius which enabled him to masquerade as a regular guy. He was able to cut to the quick of Nature's mysteries and explain in plain english what he saw there for the benefit of those of us lacking in genius.

Feynman freed us from the need to relate to quantum physics by memorizing a set of arcane mathematical expressions, and delivered to us a way of understanding the probabilistic nature of quantum reality by drawing a bunch of little arrows pointing this way and that. His method, known as "Feynman diagrams", is so simple that it seems almost childlike, yet it works every time.

The theory of Quantum ElectoDynamics is the most complete theory that science has in its arsenal. The theory explains 99% of everything we see at the classical level of reality. Feynman was never quite able to tie in the oddities observed in the interaction of nuclei or gravitrons, but reality as we observe it is more or less dictated by the interaction of electrons, and this theory describes that interplay perfectly.

Feyman's "sum over histories" explains reality even better than Newton's seemingly incontrovertable laws of Nature, which in actuality, decribe only the end result of the sum over histories. Where Newton described one reality, the one observed by all of us, Feynman described every microscopic reality, each as real as the other, and all culminating in the one macroscopic reality as described by Newton. Feynman described particles moving faster than light, and even backwards in time - all of which is explained in his "strange theory of light and matter", and all of which is endlessly verifiable in the laboratory.

For anyone willing to break out of the Newtonian mindset which humanity has been in for over 300 years, and which is still taught in today's high school science classrooms, this book is a must read. Treat yourself to 150 pages of plain english which will infuse you with wonder for the rest of your days.

Much of what we are taught in schools is an approximation and sometimes wrong. It is great to learn, even if it is only qualitatively, about more accurate representations.

I wish that Feynman were alive to keep updating his lectures with the latest developments. The lectures seem to have been last updated in 1980s and I am sure Physics has moved on since then.

"The Strange Theory of Light and Matter" is an entirely appropriate subtitle to a book that attempts to explain the theory behind phenomena that escape our everyday experience and intuition. QED is arguably the most successful scientific theory in existence. Its predictions have correlated extraordinarily well with experiment although "prediction" in the QED sense is not what we are generally used to. The quantum world is inherently probabilistic. There are certain things we just cannot "know." We cannot predict which photons will reflect of a glass surface, but with QED, we can at least accurately calculate the percentage of photons that do reflect. That's just one of the results of QED that Feynman attempts to explain, and he does so in a very straightforward fashion.

Feynman never insults the intelligence of his audience by pretending that the basics of QED are beyond its grasp, but instead repeatedly insists that no one really understands QED, but that should not prevent anyone from appreciating some of its results. With this attitude, Feynman explains the basics of partial reflection, particle interactions, and the discoveries of new particles, and he does all this through numerous figures and analogies rather than mathematical equations.

Richard Feynman was not your ordinary physicist. He was a physicist's physicist and a great teacher (read James Gleick's bio of Feynman called Genius). His teaching abilities are in full display in this book as he is able to bring an incredibly strange theory down to the average reader's level. I highly recommend this book. It will tax your thinking abilities but will never insult them.