Eye-catching image (IMAGE) Kanazawa University Caption Cage-shaped molecule that changes from left-handed to right-handed when a metal ion enters its inner cavity. The conversion speed varies up to 1000 times depending on the size of the metal ion (K+, 11 sec; Cs+, 11100 sec ≈ 3 h). Credit Ikbal et al., Sci. Adv. 9, eadj5536 (2023) Usage Restrictions The image may only be used with appropriate caption and credit. 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.