Ok, so in Halo 4, the Librarian clearly states that Forunners and Humans are 2 different species. She goes on to say that humanity started a war with the Forerunners as a result of the Flood introducing itself. But heres my question: How is it that only Humans can operate Forerunner tech and not other races, even though we went to war with Forerunners? The Librarian scattered the different races across the galaxy, meaning she saved all the current species lives. But if Elites existed in the past along with Humans and Forerunners, why can't Elites operate Forerunner tech as well? Did I miss something?
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They grossly reverse-engineered it from forerunner relics. The only select things can be activated by humans and that was because they share majority of the same DNA.