April 30, 2021 Today the National Science Board (NSB) announced that William S. Hammack is a recipient of its 2021 Public Service Award. Hammack is an engineer and author from the University of Illinois Urbana-Champaign. NSB grants its Public Service Award to individuals and groups that have contributed substantially to increasing public understanding of science and engineering. NSB is recognizing Hammack for his outstanding skills as communicator. He has authored numerous books and produced hundreds of hours of radio and video segments that explain engineering in plain language to a wide variety of audiences worldwide. His YouTube channel has over a million subscribers and the videos that he has produced there have been viewed nearly seventy million times.