Galactic winds are an important ingredient in galaxy evolution, but the physics of the ubiquitous outflowing high velocity gas seen from rapidly star-forming galaxies remains unknown. I will describe a series of projects designed to shed light on these open questions, with a focus on how to produce cool atomic and warm photo-ionized gas at high velocities. One idea is to precipitate the cool gas from the super-heated hot phase on scales outside the host galaxy. Another option is to directly accelerate the cool gas from the galaxy with momentum injection, perhaps provided by radiation pressure on dust or a putative fast, hot wind. I'll highlight challenges on both the observational and theoretical fronts, and connect to observational constraints on physical scales ranging from the host galaxy's molecular clouds to its circumgalactic medium.