Trepanned Skull (IMAGE) University of California - Santa Barbara Caption Some 900 years ago, a Peruvian healer used a hand drill to make dozens of small holes in a patient's skull. Credit Danielle Kurin 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.