It is difficult to overemphasize the importance of the freezing process in our investigation of basic precipitation mechanisms. Supercooled liquid water and ice crystals, along with the infinite processes of accretion and aggregation, continue to cover our workbench with stimulating unknown. What really makes ice erystals form the vapor and liquid phases? How do these crystals actually accrete water in the presence of atmospheric moisture? How do the aggregation process produce such a fantastic array of shapes and sizes? This year’s cover illustrates some of the products which are produced by the interaction of these process. Water vapor, hoar frost, supercooled liquid water, individual ice crystals, rime ice, and snowflakes have come together on our outdoor workbench to tease our imagination in the field of chemistry, meteorology, mechanics, cloud physics, climatology, atmospheric electricity and optics, to name only a few. The scene is in Norris Basin during one of the early years of the Yellowstone Field Research Expedition. Photograph by Thomas J. Henderson, Atmospherics Incorporated.