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The third annual event, hosted by the Chicago Park District, included a full-course meal, a live DJ and other entertainment.
David O'Donnell, 27, died and another worker was injured Thursday after they fell from scaffolding at still-under-construction University of Chicago Cancer Center. The Occupational Safety and Health Administration is investigating.
Crucially, the upper stage of the giant rocket survived atmospheric re-entry
How to build businesses that last