Grace Sun took home the Regeneron International Science and Engineering Fair's biggest prize for her work on OECT.Society for ScienceGrace Sun, a 16-year-old from Kentucky, won $75,000 for her research on biomedical devices.She took home the top prize at the ISEF — the "granddaddy of all science fairs."Her work on organic electronic devices aims to make medical implants safer and more effective.Grace Sun can't drive yet.