Homo erectus tooth thin slice (IMAGE) Goethe University Frankfurt Caption Polished thin section of a Homo erectus tooth before chemical analysis by laser ablation plasma mass spectrometry (LA-ICPMS). Credit Alessia Nava/ Luca Bondioli Usage Restrictions To be used only when referring to the press release. Give credit to Alessia Nava/ Luca Bondioli. 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.