Excel Academy Principle, Tenia Pritchard, introduces NASA astronaut Dr. Serena Auñón-Chancellor to speak about her experience on Expeditions 56 and 57 onboard the International Space Station (ISS) at Excel Academy Public Charter School, Monday, June 10, 2019 in Washington, DC. Auñón-Chancellor spent 197 days living and working onboard the ISS and contributed to hundreds of experiments in biology, biotechnology, physical science, and Earth science while there. She is also a doctor and started her career with NASA as a flight surgeon in 2006. Photo Credit: (NASA/Aubrey Gemignani)