A toothy summer in Charleston: My internship studying barium in bottlenose dolphin teeth to determine freshwater exposure Hannah Baker holding the Tamanend's bottlenose dolphin tooth samples that she used for her internship. She cut the teeth in half with a saw and used a half section to scan using scanning electron microscopy. In the cabinet behind her is 30 years of dolphin teeth samples! (Image credit: Bonnie Ertel) Download Image October 27, 2026 Hi everyone! My name is Hannah Baker and I’m a 2025 Ernest F. Hollings Scholarship student studying Earth and Environmental Sciences with a minor in Climate and Space Sciences and Engineering at the University of Michigan. For my summer internship, I worked at the National Coastal Centers for Ocean Science (NCCOS) Hollings Marine Laboratory in Charleston, South Carolina, studying Tamanend’s bottlenose dolphin teeth as a biomarker of freshwater exposure. Hannah Baker holding the Tamanend's bottlenose dolphin tooth samples that she used for…