The hydrogen bonds in water molecules play a crucial role in determining the unique properties of water, yet the science behind these bonds remains not fully understood due to their dynamic and short-lived nature. Researchers at the Swiss Federal Institute of Technology Lausanne (EPFL) have introduced a new method known as correlated vibrational spectroscopy (CVS) to delve into the electronic and nuclear quantum effects of hydrogen-bond networks in water in unprecedented detail. By utilizing ultra-fast laser pulses to differentiate interacting and non-interacting water molecules, CVS enables researchers to observe distinct vibrational patterns that reveal the movement of molecules along H-bonds. This method offers direct measurements of charge sharing between hydrogen and oxygen atoms in the bonds and sheds light on the strength of these interactions. Through CVS, scientists can quantify the impact of adding hydroxide ions and protons to water on the H-bond networks, providing precise measurements that were previously inaccessible. Moreover, the study suggests that CVS can be applied beyond water molecules to explore a wide range of chemical systems on a molecular scale. By offering a new way to study various liquids and physical systems with quantum-scale precision, CVS opens up avenues for unlocking mysteries in different scientific fields. The research, published in the journal Science, marks a significant advancement in understanding hydrogen-bond networks and presents exciting prospects for future scientific investigations.