MTSU chemistry professor and WISTEM Center Director Judith Iriarte-Gross, left, and Dot Harris, director, Office of Economic Impact and Diversity in the U.S. Department of Energy, admire the renewable energy home models built by middle school students attending the Martha O’Bryan Center in Nashville July 17. MTSU students work one day a week with the East Nashville teenagers in the Green Girls program. Iriarte-Gross oversees the WISTEM (Women in STEM) program. (MTSU photo by News and Media Relations)