![](https://pwb.princeton.edu/wp-content/uploads/sites/102/2020/07/2020_Water_droplet-1024x683.jpg)
A new study from Princeton University and Sapienza University of Rome provides strong evidence for a controversial theory that at very cold temperatures water can exist in two distinct liquid forms, one being less dense and more structured than the other. https://bit.ly/2ZElXuI