This subcategory is dedicated to the discussions and activities of the Physical Society of Indonesia (Himpunan Fisika Indonesia, HFI). Join fellow physicists, researchers, and educators in exploring the role of physics in advancing scientific knowledge and technology in Indonesia. Share insights on cutting-edge research, collaborate on interdisciplinary projects, and discuss the latest breakthroughs in fields such as condensed matter physics, quantum physics, and materials science. Explore how HFI contributes to the growth of physics in Indonesia, while also playing a pivotal role in the development of material science through fundamental physical principles. This space encourages collaboration across universities, research institutions, and industry to push the boundaries of physics and its applications in material science.