Interview with Caltech's John Eiler (AUDIO) California Institute of Technology Your browser does not support the audio element. Caption Caltech's John Eiler discusses his research using isotope geochemistry. Credit Caltech Usage Restrictions With credit as given above 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.