Thomas Edison didn’t invent electric lights, but he did create the first commercially successful lightbulb—after repeated setbacks in finding the right filament material. His invention was a game changer that speeded the process of electrification and changed forever how we live after the Sun goes down. Pratt & Whitney didn’t invent the jet engine, but it bet the proverbial farm that it could perfect the geared turbofan (GTF), a decades-old idea.  The painstaking ...


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