What childhood event was said to have caused Lex Luthor’s hatred of Superman in 1960s comics?

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In 1960s DC Comics, it was revealed that Lex Luthor’s intense hatred for Superman originated from a childhood accident caused by the young hero, then known as Superboy. This incident resulted in Luthor losing his hair, leaving him prematurely bald and fueling a lifelong, relentless obsession with destroying the world’s first superhero.1