Wine “Legs” And Minibot Motors

As wine enthusiasts know, the “legs” or “tears” that run down a glass after a gentle swirl can yield clues about a wine’s alcohol content. Interestingly, the physical phenomenon — called the Marangoni effect — responsible for creating these tears can be harnessed for practical applications. Scientists have developed  little motors that can run based on this phenomenon. The team reported this work in ACS’ journal Langmuir.