Early Human Skull Casts (IMAGE) California Academy of Sciences Caption This display at the California Academy of Sciences shows skull casts representing five of the 11 early human species analyzed in the papers. Credit California Academy of Sciences Usage Restrictions May only be used in connection with the associated press release. 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.