A wine's "legs" or "tears" are the rivulets that run down the inside of a wineglass after it is swirled or sipped. The experts are at odds over the cause and significance of a wine's legs. Some say legs help determine the quality and body of a wine, while others claim that they are a phenomenon related to the wine's alcohol content (the higher the alcohol, the heavier the legs), evaporation rate, and the surface tension of the glass. For the latter group, quality has little or nothing to do with legs. Then there's the camp that believes the legs are the result of a wine's alcohol, sugar, and glycerin content, while others declare that glycerin has nothing to do with it. In short, the jury is still out on the significance of a wine's legs.