The Engineering of Droplets

William S. Hammack
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Bill Hammack explaining the difference between Betamax and VHS recorders
File:How a Film Projector Works.webm
Video of Bill Hammack explaining how a film projector works
William (Bill) S. Hammack (born 1961) is an American chemical engineer, and Professor in the Department of Chemical Engineering at the University of Illinois at Urbana–Champaign.[1]

Hammack is well-known for his ventures in science communication as the persona Engineer Guy: between 1999 and 2005 he produced radio commentaries for Illinois Public Media, and starting in 2010, he produced a regular series of videos on YouTube explaining the engineering of everyday objects.[2] He’s also one of the authors of the book Eight Amazing Engineering Stories.[2][3]