Fifth-graders Sophie Dzyban and Olivia Simmonds apply pressure to their bridge via a bridge testing machine before it fails at 26.60 pounds per square inch.
Fifth-graders Sophie Dzyban and Olivia Simmonds apply pressure to their bridge via a bridge testing machine before it fails at 26.60 pounds per square inch. HUGH MCMILLAN Special to the Gateway
Fifth-graders Sophie Dzyban and Olivia Simmonds apply pressure to their bridge via a bridge testing machine before it fails at 26.60 pounds per square inch. HUGH MCMILLAN Special to the Gateway