Researchers throughout the world are competing to develop technology that can turn animals transparent. Up until now, scientists have had to thinly slice an animal specimen and arrange several hundred slices on slides using a microscope if they wanted to observe it - a time-consuming process that also damages the specimen. However, turning an animal specimen transparent now provides researchers with an efficient method to observe cells 3-dimensionally. The Japanese research team that developed this technology is attracting a great deal of attention. So what is this method? We'll look at the frontline of transparency technologies that are expected to have applications in the field of medical care as well.