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Initially, Superboy-Prime was the sole superhero on Earth Prime, one of the alternate variations of Earth that existed inside universe of DC Comics. Based on the storyline, each of the alternative Earths had to be eliminated to sustain one. At the end of that cataclysmic series of events, Superboy Prime, as well as Earth-Prime 's Lex Luthor and Kal-El, another alternate version of Superman, voluntarily confined themselves to some heaven -like measurement to avoid wasting the universe. With prompting from the Lex Luthor trapped with him, Superboy-Prime resolved to fix the blunder he made and ultimately broke free. In other words, he was intent on returning the presence of Earth Prime, a target he could attain only by destroying the current Earth.. .... .. When tractors were first developed, they used enormous steam engines that were notoriously unreliable and hard to maintain. These were phased out around the turn with the twentieth century and substituted for internal combustion engines which were smaller though powerful and ran on a number of fuels including kerosene, ethanol and gasoline. By the 1960s several of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel.