On November 20th, 1965 at 10:57 a.m., Allan Cosgrove, a dog walker and bonsai tree1 enthusiast, walked out of his apartment building on the outskirts of Decatur, Georgia on his way to his mother Eileen’s house. A small team of state workers fixed up the sidewalk concrete here several months beforehand, setting exactly 13 dowels of rebar before pouring the freshly mixed slurry, and smoothing it over with trowels....