We get a tour of the subatomic realm from particle physicist Bruce Schumm, the author of "Deep Down Things: The Breathtaking Beauty of Particle Physics." We'll focus on the Standard Model of particle physics, which encompasses most of what scientists know about the universe at small scales. In this first of a two-part series, we'll learn about some of the basic ingredients of the model, including particles, fields and forces. Coming up in part two, the deeper organizing principles (gauge theory and symmetry), holes in the Standard Model and next steps.