NASA astronaut Dr. Serena Auñón-Chancellor speaks 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)