A new study in Nature Physics has shed light on the long-hypothesized liquid-liquid critical point, where water exists simultaneously in two distinct liquid forms, opening up new possibilities for experimental validation. Water is known for its anomalous properties – unlike most substances, it is densest in the liquid state, not the solid. This leads to unique behaviors, such as ice floating on water. One of these unusual features has prompted decades of research to understand the unique behavior of water, especially in the supercooled regime. However, studying this phase transition (LLPT), which is thought to occur in the supercooled regime, has faced challenges that researchers wanted to address. “Water is…