Bill explains how the rise of home air conditioning had to battle the open air movements in public school: They regarded it as only for factories where it was first introduced. Only when movie theatres added air conditioning in the 1930 and 1940s did it become popular for the home.

(1/4) Intro/History: Introducing a 100-year-old mechanical computer

Bill Hammack's audio and video work emphasizes the creative role of engineers in designing and creating our world. He's a regular commentator on radio - based at Illinois Public Radio in Urbana he's appeared on public radio's premier business program Marketplace, and on Radio National Australia's Science Show. Many engineering, science, and journalistic groups have recognized his work.