In the quiet architecture of a single-celled alga, refined by millions of years of evolution, Russian scientists have found a blueprint for the future of medical imaging. By enlarging a diatom's intricate shell two thousand times and recreating it through 3D printing, researchers confirmed that nature's own light-focusing geometry can be translated into the terahertz spectrum — a range of electromagnetic waves capable of imaging the human body without the harm of X-rays. The work suggests that the most elegant solutions to modern technological scarcity may already exist, waiting to be scaled.