Microlith Blades (image) Arizona State University Share Print E-Mail Caption These microlith blades show a flat edge with a rounded "cutting" edge. Credit Simen Oestmo Usage Restrictions This image may only be used by permission of the ASU Institute of Human Origins for the purposes of illustrating coverage of the accompanying article. Share Print E-Mail 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.