On Feb. 18, 2014, Argonne hosted its 19th annual regional Rube Goldberg Machine Contest at the Chicago Children's Museum. This year, the competition called on teams to build a complex machine that took at least 20 steps to zip a zipper. Pictured here are students from Reavis High School of Burbank, Illinois, who defeated nine other teams in the contest with their Super Mario-themed Rube Goldberg machine. By winning Argonne's contest, these students will compete in the National High School Rube Goldberg Machine Championship this weekend, on Saturday, April 5, at Waukesha Country Technical College in Pewaukee, Wisconsin. View more photos from the competition here. | Photo courtesy of Argonne National Laboratory.