Gavin Metzger, 7, of Wilmerding, makes a big bubble as part of the Carnegie Science Center’s Mess Fest on Sunday, August 22, 2021, at the Science Center on the North Shore. (Emily Matthews/Post-Gazette)
MessFest
Gavin Metzger, 7, of Wilmerding, makes a big bubble as part of the Carnegie Science Center’s Mess Fest on Sunday, August 22, 2021, at the Science Center on the North Shore. (Emily Matthews/Post-Gazette)