Dr. Claudiu Stan from Rutgers University will be presenting his lecture “Understanding how supercooled water droplets freeze.”Supercooled water drops are often used for studying supercooled water and ice nucleation They also occur naturally in clouds, where their freezing impacts the formation of precipitation and the radiative balance of Earth The freezing of supercooled water drops is a complex stochastic process including nucleation, dendritic ice growth, and shape changes As a result, no two droplets freeze the same To account for this randomness, we collected snapshot images and X ray diffraction from tens of thousands of drops freezing in vacuum after homogeneous ice nucleation near 3939°C Based on the drop images, we developed a seven stage model of freezing and determined average properties for all freezing stages.