Reconstructed Projectile Points (IMAGE) University of Washington Caption University of Washington researchers re-created ancient projectile points to test their effectiveness. From left to right: stone, microblade and bone tips. Credit Janice Wood 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.