Computer Simulations (IMAGE) Institute for Basic Science Caption Computer simulations of population density of Neanderthals (left) and Homo sapiens (right) 43,000 years ago (upper) and 38,000 years ago (lower). Orange (green) circles indicate archeological sites of Neanderthals (Homo sapiens) during 5,000-year-long intervals centered around 43 and 38 thousand years before present. Credit IBS Usage Restrictions Please indicate the credit. 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.