Incoming University of Oklahoma engineering students build Rube Goldberg machines - Article Photos 7/7

Darryl Prevoc, 18, of Houston, prepares dominoes for a Rube Goldberg-inspired machine that would hammer a nail. The University of Oklahoma held a competition Tuesday during a summer class for incoming engineering students to see which group could make a contraption hammer a nail. Photo by K.T. KING, The Oklahoman KT King