Research site (IMAGE) Max Planck Institute of Geoanthropology Caption The site of Khall Amayshan 4 in northern Saudi Arabia, where evidence of repeated visits by early humans over the last 400,000 years was found, associated with the remains of ancient lakes Credit Palaeodeserts Project (photo by Michael Petraglia) Usage Restrictions Use of images is limited to editorial coverage of scientific topics relating to the activities of the Max Planck Society. Any kind of commercial use (including, in particular, the exploitation of images by means of sale or incorporation in image databases or image catalogues) as well as any promotional use/use for merchandise purposes, disclosure to third parties or granting of related rights to third parties is expressly not permitted. License Original 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.