Oldowan Chopper (image) Washington State University Share Print E-Mail Caption Paleoanthropologist Louis Leakey suggested in the 1960s that the Oldowan chopper, a crude stone tool, was the result of humans sharing information with each other. Researchers are now challenging that assumption. Credit Bob Hubner, WSU Photo Services Usage Restrictions Please credit 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.