When a drop of diluted bourbon evaporates on a glass coverslip, the residual solids can leave behind an intricate weblike pattern. For a web to form, the drop’s alcohol concentration typically must fall in the range of 20–25% alcohol by volume (ABV). The “whiskey web” shown here comes from a 12-month-old sample at 20% ABV, manufactured by Brown-Forman Corp. For a discussion of the fluid dynamics behind such patterns, turn to the Quick Study on page 62 . (Image courtesy of Stuart J. Williams, University of Louisville.)