Researchers and doctors are using incredibly tiny particles — fluorescent nanoparticles — in a quest for new ways to fight cancer. Some nanoparticles, just billionths of a meter across, are engineered to carry special dye that glows when it hits cancer cells. Oregon State University scientists say this makes it easier for surgeons to find and remove tumors. Iryna Matviichuk visited Portland and learned the new procedure is closer to testing in human patients. Anna Rice narrates her report.