Roderick Blair was surprised when scientific researchers appeared on his doorstep in the Homewood neighborhood of Pittsburgh, Pennsylvania.
Here, on a recent summer day, police cars, an ambulance and a TV reporter crowded into a driveway on the edge of the neighborhood. A helicopter swung overhead. Saplings peeked over rooflines from gutters, windows were broken, screens tattered, doors boarded up and rippling sidewalks crumbled. Bedraggled chain link fences held back the season’s tall grass.
