The discussion centers on the Hydrogen bond Auto-correlation function in computational chemistry, particularly within molecular dynamics and simulations. It explains that the autocorrelation function measures the correlation of hydrogen bond populations over time. The terms "intermittent" and "continuous" hydrogen bonds refer to the nature of these bonds during simulations, with the former indicating temporary interactions and the latter indicating stable, ongoing connections. The decay of the autocorrelation graph over time is significant as it relates to reaction rates influenced by hydrogen bond dynamics and bulk properties like viscosity. The conversation also touches on the viscosity of different oils, using 10W-40 motor oil and WD-40 as examples, to illustrate how viscosity can be affected by hydrogen bonding. Additionally, there is a query about the specific tau values for hydrogen bonding autocorrelation in pure water versus water containing ions like KCl and LiCl, indicating a need for further research on these values.