Back to Chats with Change Makers episodes Katie Kelly Tiffany chats with Katie Kelly, a Bridge Design Engineer at Barge Design Solutions and member of the American Society of Civil Engineers, who ensures public safety by evaluating old bridges and designing new ones. Save At-home activities Marble Run Build a marble run that makes a marble move as slowly as possible. View activity Stongest Shapes Using only index cards and tape, build a structure so it can hold a load and not fall down. View activity Explore more at-home-activities Explore more STEM Careers STEM Activities Sign up for Chats with Change Makers emails Email address