Fully assembled O2-Macrodevice (IMAGE) Massachusetts Institute of Technology Caption Optical image of cathode side of fully assembled O2-Macrodevice showing, with a United States quarter-dollar coin for scale. Credit Image courtesy of Claudia Liu and Dr. Siddharth Krishnan, MIT/Boston Children’s Hospital Usage Restrictions Credit must be given to the creator. No derivatives or adaptations of the work are permitted. License CC BY-ND Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.