Bill Hammack is one part Mr. Wizard and one part James Burke. He’s a professor of Chemical Engineering at the University of Illinois at Urbana-Champaign, and his alter ego Engineer Guy has made over 300 public radio spots emphasizing the creative aspects of science and engineering. In this three minute video, Bill tears apart a photocopier and explains, with great wit and wisdom, how it works. Ten more videos are available at his site. I especially like the one about tantalum. [via Boing Boing]