Liana Zaroubi (IMAGE) Concordia University Caption Liana Zaroubi: “I eliminated many hypotheses before finding that geosmin acted as a warning signal.” Credit Liana Zaroubi Usage Restrictions None 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.