Chemistry professor Robert Pribush explains how to check for acetic acid content in vinegar to students in his general chemistry class at Butler University in Indianapolis, Ind. The American Chemical Society (ACS) named Pribush as the 2014 ACS Volunteer Service Award winner for his contribution to the society's goals and objectives. Pribush has been a chemistry professor at Butler University for 40 years and is a fellow with the American Chemical Society. Mike Wolanin / The Daily Journal