Sohn had some doubts, which sparked the idea of a science project to hopefully prove mom wrong. “I wanted to investigate the effects of probiotics, metformin on ischemia, reperfusion injuries on roundworms,” Sohn said. “I treated the roundworms in three different timeframes: five days before hypoxia, two days before hypoxia and one day after hypoxia,” Sohn said. So I used nitrogen through a chamber.”Joanna Sohn, a 13-year old STEM student from San Antonio has been named one of the most promising middle school STEM students in the country. (KSAT)Her science project is also testament to the young student’s resiliency and creativity.