Each American Chemical Society (ACS) National Meeting & Exposition attracts 11,000-16,000 chemists, chemical engineers, academics, students, and other professionals. Presentations cover a broad range of fields where chemistry plays a central role, including food and nutrition, medicine and health, drug development, energy, materials science, and the environment. This year’s theme, “Macromolecular Chemistry: The Second Century,” celebrates advances that have made polymer materials from adhesives and fibers to coatings, packaging, and robust plastics ubiquitous in daily life.