Erasto Mpemba’s observations initiated decades of research into the Mpemba effect: whether a liquid (typically water) which is initially hot can freeze faster than the same liquid which begins cold.

More information: Shahaf Aharony Shapira et al, Inverse Mpemba Effect Demonstrated on a Single Trapped Ion Qubit, Physical Review Letters (2024). DOI: 10.1103/PhysRevLett.133.010403 . On arXiv ...