Dave McMahan Takes Notes (IMAGE) U.S. National Science Foundation Caption Dave McMahan, Neva Project principal investigator, takes notes in a completed excavation block. Credit Gleb Mikhalev 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.