The Mysterious Efimov Scenario (IMAGE) University of Innsbruck Caption Physicists have measured the second Efimov resonance of three particles in an ultracold quantum gas, thus, proving the periodicity of this universal physical phenomenon experimentally. Credit IQOQI/Harald Ritsch Usage Restrictions Only for reports on research from Innsbruck Physics 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.