The most recent effort by by Retro Report, a documentary news organization that tries to find out “What really happened,” “How did these events change us” and “What are the lingering consequences that may affect our society to this day,” is focused on a tragic story familiar to Minnesotans: The Aug. 1, 2007 collapse of the Interstate Hwy. 35W bridge over the Mississippi River in downtown Minneapolis, which killed 13 people, injured more than 100 and prompted a national discussion on the deteriorating condition of the country’s infrastructure.