A Simple Unified Theory: From Magnetism to Gravity, a new title by H.C. Huang, probes our current scientific understanding of the universe. Huang's quest for possible answers to some of modern physics' most basic, yet baffling, questions, takes the reader on an illuminating journey to the boundaries of science. The author traverses the broad, but interconnected, landscape of particle physics: from the origins of magnetic force, to wave-particle parallelism and color force and color charges, to gravity's source. Huang's theories are presented in four, interrelated parts. Part I, "Magnetic Bars: Origins of Magnetic Force," considers the origin of the "mystic" force and its behavior, including the mechanism of repulsion and attraction. Part II, "Photons: Wave-Particle Parallelism," considers the dual nature of light. Along with Einstein, who insisted that photons are particles, Huang concurs, proposing the foundation for this agreement. Part III, "On Color Force and Color Charges," approaches the structure of the atom to derive both the strong and weak forces. Finally, in Part IV, "Gravity's Source," Huang discusses the structure of gravity. He also suggests why the Earth's magnetic polarities change and why beams of light cannot be woven into fabric to hold any mass. Author's illustrations are included.