Glass shard (IMAGE) Arizona State University Caption A tiny glass shard less than the diameter of human hair was recovered from a Middle Stone Age site in northwest Ethiopia. Its chemistry matches that of the Toba supervolcano located on the other side of the world in Indonesia. The people who lived at this archaeological site survived the supereruption because of their behavioral flexibility. Credit Photograph by Racheal Johnsen. Usage Restrictions None. License Original 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.