I was a part of this science celebration on Daley Plaza in honor of National Chemistry week. This week all shows will have a few extra chemistry experiments and spooky science demonstrations.
http://pubs.acs.org/cen/news/84/i40/8440periodictable.html
I performed before Maggie Daley a ball drop experiment where I asked for predictions during the Chicago event. It was a great day. I was representing the Chicago Public Libraries at this event as thier Scienctist in Residence.