7 year old Samuel Cornell of Naperville and 15 year old Mike Perry of Chicago put together LEGO skyscrapers on the earthquake simulator. The Museum of Science and Industry presented "From Sidewalks to Skyscrapers" at The CTL Group on Saturday, June 16, 2012 in Skokie. | Joel Lerner~Sun-Times Media

7 year old Samuel Cornell of Naperville watches his skyscraper fall as 15 year old Mike Perry of Chicago's building stands on the earthquake simulator. The Museum of Science and Industry presented "From Sidewalks to Skyscrapers" at The CTL Group on Saturday, June 16, 2012 in Skokie. | Joel Lerner~Sun-Times Media

Larry Novak of the Portland Cement Association controls the earthquake simulator. The earthquake The Museum of Science and Industry presented "From Sidewalks to Skyscrapers" at The CTL Group on Saturday, June 16, 2012 in Skokie. | Joel Lerner~Sun-Times Media

15 year old Mike Perry looks for the right Lego parts at the Portland Cement Association. The Museum of Science and Industry presented "From Sidewalks to Skyscrapers" at The CTL Group on Saturday, June 16, 2012 in Skokie. | Joel Lerner~Sun-Times Media

11 year old Kevin Xing and Larry Novak, a structural engineer for the Portland Cement Association demonstrate the structural strength of a Fed Ex box. The Museum of Science and Industry presented "From Sidewalks to Skyscrapers" at The CTL Group on Saturday, June 16, 2012 in Skokie. | Joel Lerner~Sun-Times Media