Angie Belcher's curiosity took her from studying seashells to engineering viruses that light up hidden tumors. Seeded deep within the body, ovarian cancer is hard to detect early; by the time symptoms appear, it has often metastasized. Her imaging tools can detect tumors as small as half a millimeter, aiming to catch cancer when it can be removed before spreading. Belcher believes early detection could become routine within a decade.