"The true power of biophotonics—not just creating sophisticated imaging systems, but transforming complex biological and physical phenomena into intuitive, accessible tools that directly impact patient care," YongKeun Park, plenary speaker for #OpticaBiophotonics26, told Optica. As a professor in the Department of Physics at KAIST and the director of the Virtual 3D Biology Center, Park is at the forefront of developing 3D imaging techniques and AI-enabled applications for biology and medicine to revolutionize our understanding of human health. Ahead of the Optica Biophotonics Congress, we asked Park about the emerging application he is most excited to see: 3D biology and its impact on regenerative medicine. "We are now entering a new era of 3D biology. Advances such as organoids and microphysiological systems are enabling us to model human organs, study developmental processes, and evaluate drug responses in ways that are far more physiologically relevant. This convergence of 3D b...