Electricity and Magnetism! The Beauty of Symmetry and Symmetry Breaking! Magnetic Monopoles! A Sensation in Academia! A Theoretical Frenzy!

Britain, Cambridge University.

After finishing his lecture, Dirac remained in his office.

He had conceived an entirely new idea about Quantum Field Theory.

As early as on the ship back from Singapore, he had asked Bohr a very simple question:

"Professor Bohr, why is electric charge quantized?"

Electromagnetism had been developing for over a hundred years, yet it seemed no one had ever considered this question.

Even after the concept of quanta was born, it was energy that was quantized first.

Because in everyone's experience, energy was continuous and infinitely divisible.

Thus, the quantization of energy drew particular attention.

But electric charge was different.

Ever since the discovery of the electron, the physics community had tacitly accepted that the charge carried by one electron was one fundamental unit of negative charge.

Later, as Atomics delved ever deeper, people discovered other particles such as protons and neutrons.

Coincidentally, the charge carried by a proton was also one fundamental unit of charge—and it was positive.

Why couldn't a proton carry 1.5 units of positive charge?

Then two protons could balance the charges of three electrons, and perhaps atomic structures could still remain stable.

In other words, why were the charges of all charged particles integer multiples of the electron's charge rather than fractional multiples?

No one had ever considered this question.

Perhaps someone had, but they did not know how to explain it.

At the time, Bohr had answered like this:

"This is one of the universe's underlying rules."

"Just like why the speed of light is 300,000 kilometers per second."

"It is an axiom. There is no way to derive it from more fundamental concepts."

Yet Dirac was not satisfied with that answer.

He immediately asked another strange question.

"From the perspective of symmetry, electricity and magnetism should be symmetrical with