Searching for a theory of everything; it is a simple and comprehensive explanation for all physical phenomena in the universe; confronting the probelms in the standard model of particle physics and the general theory of relativity.

Electricity and magnetism; James Clerk Maxwell demontrates how they are aspects of a single underlying force; demonstrating how unification works in physics; Maxwell's equations of electromagnetism make a prediction.

The discovery of the paradoxical world of light; the theory of quantum mechanics; how light and matter behave as both particles and waves; exploring evidence for this curious feature of the quantum world.

Einstein's theory of relativity; the theory is proposed in 1905; common misconceptions about this view of time and space; mass-energy equivalence; the impossibility of faster-than-light travel; the space-time continuum.

The theory of quantum electrodynamics; the quantum world; subatomic behavior; QED unites quantum mechanics with special relativity; how the Feynman diagrams are really equations in disguise.

Studying the weak nuclear force; reasons for beta decay; it is the emission of an electron from a nucleus during radioactive decay; transformations that pose a challenges to a theory of everything.