Rotating refrigerator (IMAGE) Lancaster University Caption Researchers cooled superfluid helium-3 to near absolute zero (minus 273.15°C) inside this rotating refrigerator, where two time crystals were created and brought into touch. Credit © Aalto University/Mikko Raskinen 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.