Kai Rannenberg and Indra Spiecker (IMAGE) Goethe University Frankfurt Caption Kai Rannenberg and Indra Spiecker Credit Dettmar/Goethe University Usage Restrictions None 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.