Human hand as an infrared light source (IMAGE) Proceedings of the National Academy of Sciences Caption Human hand as an infrared light source, with each finger emitting infrared light independently. Image courtesy of Shun An. Credit Image credit: Shun An. Usage Restrictions None License Licensed content 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.