Explore a comprehensive physics lecture from the Kavli Institute for Theoretical Physics Teachers' Conference that delves into Quantum Field Theory (QFT) as the fundamental language of theoretical physics. Discover how particle physics has evolved from studying subatomic components to investigating the dark universe, while examining the mathematical structures connecting quantum mechanics and gravity. Learn from expert physicist Grant Remmen of New York University's Center for Cosmology and Particle Physics as part of a broader workshop on particle theory frontiers. Gain insights into cutting-edge theoretical developments alongside fellow educators and researchers in this 82-minute presentation designed for physics, physical science, math, and computer science teachers at K-12 and 2-year college levels, as well as teacher preparation students.