A middle school physical science teacher in Charleston, West Virginia, Sarah Medina builds practical classroom experiments using simple grocery-store supplies. She contributes pieces on introductory physics and chemistry for Biology Insights. She began her teaching career in elementary classrooms, later taking a post working with middle schoolers on concepts like matter, density, and chemical reactions. Medina graduated with a bachelor of science in science education and works regularly to show students how common household items illustrate physical principles.