Guosong Hong, a materials scientist and physicist at Stanford University, unveils groundbreaking techniques to turn living tissue transparent using a common food dye. This innovation promises to revolutionize medical imaging, allowing doctors to see deep into the body without surgery. Hong discusses the challenges of light penetration in biological tissues and explores intriguing applications, including optogenetics and ultrasound for non-invasive treatments. He also shares insights on the transparency found in aquatic species, highlighting nature's mysteries.