Light
The book begins with one photon passing one sharp edge, then builds toward the single-slit and double-slit patterns. I work through a physical particle model for what happens at each edge and how the familiar bright and dark bands can form without treating light as a wave.
Matter
The same physical approach is carried into electrons, protons, neutrons, and atoms. The question is simple: can stable matter form from continuing motion, and what physically holds those structures together?
Gravity
The final part asks what physically causes gravitational attraction. I develop a particle model connecting light, matter, and gravity, then compare its predictions with experiment and observation.