Attendees of the p4 Summit listen to a speaker at the Energy Innovation Center in Uptown. (Andrew Rush/Post-Gazette)

By / Pittsburgh Post-Gazette

Attendees of the p4 Summit listen to a speaker at the Energy Innovation Center in Uptown. (Andrew Rush/Post-Gazette)

Attendees of the p4 Summit listen to a speaker at the Energy Innovation Center in Uptown. (Andrew Rush/Post-Gazette)

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